Add removeHotkey to keyboard module, closes #110

Takes a string, number, or hotkey object.

src/modules/keyboard.coffee

@@ -30,6 +30,13 @@ class Keyboard
       @hotkeys[which].push(hotkey)
     )
 
+  removeHotkey: (hotkey) ->
+    hotkey = if Keyboard.hotkeys[hotkey] then Keyboard.hotkeys[hotkey] else hotkey
+    hotkey = if _.isObject(hotkey) then hotkey else { key: hotkey }
+    which = if _.isNumber(hotkey.key) then hotkey.key else hotkey.key.toUpperCase().charCodeAt(0)
+    for handler in @hotkeys[which] || []
+      return handler.callback if _.isEqual(hotkey, _.omit(handler, 'callback'))
+
   toggleFormat: (range, format) ->
     if range.isCollapsed()
       delta = @quill.getContents(Math.max(0, range.start-1), range.end)

test/unit/modules/keyboard.coffee

@@ -80,5 +80,20 @@ describe('Keyboard', ->
       expect(dom($('.ql-bold').get(0)).hasClass('ql-active')).toBe(true)
       expect(dom($('.ql-size').get(0)).value()).toBe(size)
     )
+
+    it('removeHotkey by name', ->
+      fn = @quill.getModule('keyboard').removeHotkey('BOLD')
+      expect(typeof fn).toBe('function');
+    )
+
+    it('removeHotkey by number', ->
+      fn = @quill.getModule('keyboard').removeHotkey(13)
+      expect(typeof fn).toBe('function');
+    )
+
+    it('removeHotkey by object', ->
+      fn = @quill.getModule('keyboard').removeHotkey({ key: 'B', metaKey: true })
+      expect(typeof fn).toBe('function');
+    )
   )
 )