Merge pull request #146 from suzuki-0000/bugfix/#145

fixed scrolling performance, result of adding padding to the displaye…

update change log.

update podspec for 3.1.0

goes 3.0.2

Skip loading image if already loaded #135.

update read me v3.0.x

Merge pull request #127 from suzuki-0000/feature/clean

Refactoring for swift3.0, clean code for massive view controller .  #125

update podspec for swift2.3

compile-time-optimization.

update pod spec.