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diff --git a/vendor/github.com/nsf/termbox-go/api_common.go b/vendor/github.com/nsf/termbox-go/api_common.go
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+++ b/vendor/github.com/nsf/termbox-go/api_common.go
@@ -0,0 +1,228 @@
+// termbox is a library for creating cross-platform text-based interfaces
+package termbox
+
+// public API, common OS agnostic part
+
+type (
+        InputMode  int
+        OutputMode int
+        EventType  uint8
+        Modifier   uint8
+        Key        uint16
+        Attribute  uint64
+)
+
+// This type represents a termbox event. The 'Mod', 'Key' and 'Ch' fields are
+// valid if 'Type' is EventKey. The 'Width' and 'Height' fields are valid if
+// 'Type' is EventResize. The 'Err' field is valid if 'Type' is EventError.
+type Event struct {
+        Type   EventType // one of Event* constants
+        Mod    Modifier  // one of Mod* constants or 0
+        Key    Key       // one of Key* constants, invalid if 'Ch' is not 0
+        Ch     rune      // a unicode character
+        Width  int       // width of the screen
+        Height int       // height of the screen
+        Err    error     // error in case if input failed
+        MouseX int       // x coord of mouse
+        MouseY int       // y coord of mouse
+        N      int       // number of bytes written when getting a raw event
+}
+
+// A cell, single conceptual entity on the screen. The screen is basically a 2d
+// array of cells. 'Ch' is a unicode character, 'Fg' and 'Bg' are foreground
+// and background attributes respectively.
+type Cell struct {
+        Ch rune
+        Fg Attribute
+        Bg Attribute
+}
+
+// To know if termbox has been initialized or not
+var (
+        IsInit bool = false
+)
+
+// Key constants, see Event.Key field.
+const (
+        KeyF1 Key = 0xFFFF - iota
+        KeyF2
+        KeyF3
+        KeyF4
+        KeyF5
+        KeyF6
+        KeyF7
+        KeyF8
+        KeyF9
+        KeyF10
+        KeyF11
+        KeyF12
+        KeyInsert
+        KeyDelete
+        KeyHome
+        KeyEnd
+        KeyPgup
+        KeyPgdn
+        KeyArrowUp
+        KeyArrowDown
+        KeyArrowLeft
+        KeyArrowRight
+        key_min // see terminfo
+        MouseLeft
+        MouseMiddle
+        MouseRight
+        MouseRelease
+        MouseWheelUp
+        MouseWheelDown
+)
+
+const (
+        KeyCtrlTilde      Key = 0x00
+        KeyCtrl2          Key = 0x00
+        KeyCtrlSpace      Key = 0x00
+        KeyCtrlA          Key = 0x01
+        KeyCtrlB          Key = 0x02
+        KeyCtrlC          Key = 0x03
+        KeyCtrlD          Key = 0x04
+        KeyCtrlE          Key = 0x05
+        KeyCtrlF          Key = 0x06
+        KeyCtrlG          Key = 0x07
+        KeyBackspace      Key = 0x08
+        KeyCtrlH          Key = 0x08
+        KeyTab            Key = 0x09
+        KeyCtrlI          Key = 0x09
+        KeyCtrlJ          Key = 0x0A
+        KeyCtrlK          Key = 0x0B
+        KeyCtrlL          Key = 0x0C
+        KeyEnter          Key = 0x0D
+        KeyCtrlM          Key = 0x0D
+        KeyCtrlN          Key = 0x0E
+        KeyCtrlO          Key = 0x0F
+        KeyCtrlP          Key = 0x10
+        KeyCtrlQ          Key = 0x11
+        KeyCtrlR          Key = 0x12
+        KeyCtrlS          Key = 0x13
+        KeyCtrlT          Key = 0x14
+        KeyCtrlU          Key = 0x15
+        KeyCtrlV          Key = 0x16
+        KeyCtrlW          Key = 0x17
+        KeyCtrlX          Key = 0x18
+        KeyCtrlY          Key = 0x19
+        KeyCtrlZ          Key = 0x1A
+        KeyEsc            Key = 0x1B
+        KeyCtrlLsqBracket Key = 0x1B
+        KeyCtrl3          Key = 0x1B
+        KeyCtrl4          Key = 0x1C
+        KeyCtrlBackslash  Key = 0x1C
+        KeyCtrl5          Key = 0x1D
+        KeyCtrlRsqBracket Key = 0x1D
+        KeyCtrl6          Key = 0x1E
+        KeyCtrl7          Key = 0x1F
+        KeyCtrlSlash      Key = 0x1F
+        KeyCtrlUnderscore Key = 0x1F
+        KeySpace          Key = 0x20
+        KeyBackspace2     Key = 0x7F
+        KeyCtrl8          Key = 0x7F
+)
+
+// Alt modifier constant, see Event.Mod field and SetInputMode function.
+const (
+        ModAlt Modifier = 1 << iota
+        ModMotion
+)
+
+// Cell colors, you can combine a color with multiple attributes using bitwise
+// OR ('|').
+const (
+        ColorDefault Attribute = iota
+        ColorBlack
+        ColorRed
+        ColorGreen
+        ColorYellow
+        ColorBlue
+        ColorMagenta
+        ColorCyan
+        ColorWhite
+        ColorDarkGray
+        ColorLightRed
+        ColorLightGreen
+        ColorLightYellow
+        ColorLightBlue
+        ColorLightMagenta
+        ColorLightCyan
+        ColorLightGray
+)
+
+// Cell attributes, it is possible to use multiple attributes by combining them
+// using bitwise OR ('|'). Although, colors cannot be combined. But you can
+// combine attributes and a single color.
+//
+// It's worth mentioning that some platforms don't support certain attributes.
+// For example windows console doesn't support AttrUnderline. And on some
+// terminals applying AttrBold to background may result in blinking text. Use
+// them with caution and test your code on various terminals.
+const (
+        AttrBold Attribute = 1 << (iota + 9)
+        AttrBlink
+        AttrHidden
+        AttrDim
+        AttrUnderline
+        AttrCursive
+        AttrReverse
+        max_attr
+)
+
+// Input mode. See SetInputMode function.
+const (
+        InputEsc InputMode = 1 << iota
+        InputAlt
+        InputMouse
+        InputCurrent InputMode = 0
+)
+
+// Output mode. See SetOutputMode function.
+const (
+        OutputCurrent OutputMode = iota
+        OutputNormal
+        Output256
+        Output216
+        OutputGrayscale
+        OutputRGB
+)
+
+// Event type. See Event.Type field.
+const (
+        EventKey EventType = iota
+        EventResize
+        EventMouse
+        EventError
+        EventInterrupt
+        EventRaw
+        EventNone
+)
+
+// AttributeToRGB converts an Attribute to the underlying rgb triplet.
+// This is only useful if termbox is in Full RGB mode and the specified
+// attribute is also an attribute with r, g, b specified
+func AttributeToRGB(attr Attribute) (uint8, uint8, uint8) {
+        var color uint64 = uint64(attr) / uint64(max_attr)
+        // Have to right-shift with the highest attribute bit.
+        // For this, we divide by max_attr
+        var b uint8 = uint8(color % 256)
+        var g uint8 = uint8(color >> 8 % 256)
+        var r uint8 = uint8(color >> 16 % 256)
+        return r, g, b
+}
+
+// RGBToAttribute is used to convert an rgb triplet into a termbox attribute.
+// This attribute can only be applied when termbox is in Full RGB mode,
+// otherwise it'll be ignored and no color will be drawn.
+// R, G, B have to be in the range of 0 and 255.
+func RGBToAttribute(r uint8, g uint8, b uint8) Attribute {
+        var color uint64 = uint64(b)
+        color += uint64(g) << 8
+        color += uint64(r) << 16
+        color += 1 << 25
+        color = color * uint64(max_attr)
+        // Left-shift back to the place where rgb is stored.
+        return Attribute(color)
+}