Bug Fixes

• Fix memory issue when play YYSpriteSheetImage with unreleased CG raster data.
• Fix empty return value from YYCGImageCreateWithWebPData when decode webp frame with nonzero canvas offset. #41
• Fix nil return value when encode animated GIF from data source. #44

Debug log and bugfix

Add debug log for WebP decoder when decode WebP without WebP subspec.
Fix incorrectly GIF loop count value.

Bug fixes

• Destroy pthread_mutex on dealloc
• Avoid duplicate symbol error when use -all_load link flag #24

First release, stable API

• Bug fixes
• Swift api compatibility
• Make WebP framework as an optional subspec
• Support broken webp file