Changed the love.keypressed and love.keyreleased event callbacks to be love.keypressed(key, scancode, isrepeat) and love.keyreleased(key, scancode). Added love.keyboard.isScancodeDown. Resolves issue #993.

--HG--
branch : minor

src/modules/keyboard/wrap_Keyboard.h

@@ -33,6 +33,7 @@ namespace keyboard
 int w_setKeyRepeat(lua_State *L);
 int w_hasKeyRepeat(lua_State *L);
 int w_isDown(lua_State *L);
+int w_isScancodeDown(lua_State *L);
 int w_getKeyFromScancode(lua_State *L);
 int w_getScancodeFromkey(lua_State *L);
 int w_setTextInput(lua_State *L);