Release Name: 2.0.1a

Notes:
Ruby/SDL binary, dll with ruby interpreter.
Ruby/SDL 2.0.1 and Ruby 1.8.6-p114.



Changes:
(2.1)
* fix some compile error
* new exception class: VideoMemoryLost 

(2.0)
some changes for ruby 1.9
Remove Old SDL::Event, and rename SDL::Event2 to SDL::Event
Change internal implementation
fix SDL_RWops code
Fix/Improve documents
Improve English documents
Add module SDL::GL
Add following methods
* SDL::Surface#load_bmp_from_string
* SDL::Surface#load_from_string
* SDL::Mixer::Wave#load_from_string
* SDL::Mixer.playing_channels
Remove following methods
* SDL::Surface#draw_ellispe
* SDL::Surface#draw_filled_ellispe
* SDL::Surface#rotate_surface
* SDL::Surface#rotate_scaled_surface
* SDL.rotate
* SDL.rotate_blit
* SDL.rotate_scaled_blit
* SDL.rotate_xy_scaled
* SDL::Surface#destroy
* SDL::Joystick#close
* SDL::Mixer#close
* SDL::Mixer::Wave#destroy
* SDL::Mixer::Music#destroy
Change behavior of following methods
* SDL::Surface#draw_line
* SDL::Surface#draw_circle
* SDL::Surface#draw_rect
* SDL::Surface#draw_ellipse
* SDL::Surface#draw_bezier
Rename following methods
* SDL.auto_lock? -> SDL::Surface.auto_lock?
* SDL.auto_lock_on -> SDL::Surface.auto_lock_on
* SDL.auto_lock_off -> SDL::Surface.auto_lock_off
* SDL.transform_blit -> SDL::Surface#transform_blit
* SDL.blitSurface -> SDL::Surface.blit
* SDL.get_video_surface -> SDL::Screen.get
* SDL.set_video_mode -> SDL::Screen.open
* SDL.check_video_mode -> SDL::Screen.check_mode
* SDL.list_modes -> SDL::Screen.list_modes
* SDL.set_gamma -> SDL::Screen.set_gamma
* SDL.get_gamma_ramp -> SDL::Screen.get_gamma_ramp
* SDL.set_gamma_ramp -> SDL::Screen.set_gamma_ramp
* SDL.video_driver_name -> SDL::Screen.driver_name
* SDL.video_info -> SDL::Screen.info
* SDL::Surface#get_rgb -> SDL::PixelFormat#get_rgb
* SDL::Surface#get_rgba -> SDL::PixelFormat#get_rgba
* SDL::Surface#map_rgb -> SDL::PixelFormat#map_rgb
* SDL::Surface#map_rgba -> SDL::PixelFormat#map_rgba
* SDL::Surface#get_palette -> SDL::PixelFormat#palette
* SDL::Surface#bpp -> SDL::PixelFormat#bpp
* SDL::Surface#bytes_per_pixel -> SDL::PixelFormat#bytes_per_pixel
* SDL::Surface#[RGBA]mask -> SDL::PixelFormat#[RGBA]mask
* SDL::Surface#[RGBA]shift -> SDL::PixelFormat#[RGBA]shift
* SDL::Surface#[RGBA]loss -> SDL::PixelFormat#[RGBA]loss
* SDL::Surface#colorkey -> SDL::PixelFormat#colorkey
* SDL::Surface#alpha -> SDL::PixelFormat#alpha
* SDL.get_GL_attr -> SDL::GL.get_attr
* SDL.set_GL_attr -> SDL::GL.set_attr
* SDL.GL_swap_buffers -> SDL::GL.swap_buffers
Move following constants
* GL_RED_SIZE -> GL::RED_SIZE
* GL_GREEN_SIZE -> GL::GREEN_SIZE
* GL_BLUE_SIZE -> GL::BLUE_SIZE
* GL_ALPHA_SIZE -> GL::ALPHA_SIZE
* GL_BUFFER_SIZE -> GL::BUFFER_SIZE
* GL_DOUBLEBUFFER -> GL::DOUBLEBUFFER
* GL_DEPTH_SIZE -> GL::DEPTH_SIZE
* GL_STENCIL_SIZE -> GL::STENCIL_SIZE
* GL_ACCUM_RED_SIZE -> GL::ACCUM_RED_SIZE
* GL_ACCUM_GREEN_SIZE -> GL::ACCUM_GREEN_SIZE
* GL_ACCUM_BLUE_SIZE -> GL::ACCUM_BLUE_SIZE
* GL_ACCUM_ALPHA_SIZE -> GL::ACCUM_ALPHA_SIZE