add test make target
compare color value in blitbufer tests
Merge pull request #89 from hwhw/fix-blitbuffer

fix blitbuffer rotation
add half done ffi pic module
fix fail on init of tesseract
Merge pull request #90 from hwhw/framebuffer-sdl

FFI module for SDL framebuffer
Merge pull request #91 from houqp/houqp-master

half done ffi pic module
Merge pull request #92 from chrox/master

fix fail on init of tesseract