supported DXRubySDL::Input.x and DXRubySDL::Input.y.
supported DXRubySDL::Image.load_tiles.
separated DXRubySDL::Window spec.
refactored DXRubySDL::Window.draw spec.
use fixture_path.
added DXRubySDL::Window.draw with separated Image by #load_tiles spec.
added alias DXRubySDL::Window.drawFont.
fixed DXRubySDL::Image.load_tiles aliases spec.
supported DXRubySDL::Image#slice.
added key code constants to DXRubySDL.
supported DXRubySDL::Input.pad_down?.
DXRubySDL::Input.pad_down? supported P_BUTTON1 and P_BUTTON2.
added alias DXRubySDL::Input.padDown?.
supported DXRubySDL::Input.mouse_pos_x and DXRubySDL::Input.mouse_pos_y.
added tutorial from DXRuby's tutorial.

DXRuby's tutorial are http://dxruby.sourceforge.jp/DXRubyReference/200953183259625.htm.
supported DXRubySDL::Input.key_push?.