Add the possibility to assign a keyboard shortcut to color quantization (#999)

data/gui.xml

@@ -389,6 +389,9 @@
       <key command="SetColorSelector">
         <param name="type" value="ryb-wheel" />
       </key>
+      <key command="LoadPalette" />
+      <key command="SavePalette" />
+      <key command="ColorQuantization" />
     </commands>
 
     <!-- Keyboard shortcuts to select tools -->

src/app/commands/cmd_color_quantization.cpp

@@ -1,5 +1,5 @@
 // Aseprite
-// Copyright (C) 2001-2015  David Capello
+// Copyright (C) 2001-2016  David Capello
 //
 // This program is free software; you can redistribute it and/or modify
 // it under the terms of the GNU General Public License version 2 as
@@ -75,7 +75,7 @@ private:
 
 ColorQuantizationCommand::ColorQuantizationCommand()
   : Command("ColorQuantization",
-            "Color Quantization",
+            "Create Palette from Current Sprite (Color Quantization)",
             CmdRecordableFlag)
 {
 }