Update README.md

Updated documentation to reflect changes of the "enabled" attribute to "is_enabled"

Merge pull request jd-alexander#17 from konifar/vector_drawable_support

Vector drawable support

downgraded gradle

Merge remote-tracking branch 'origin/master'

added animation scale/size method and xml attribute

added enable/disable functionality

Update README.md

Updated documentation re: Passing LikeButton to event listeners.

made changes to method naming

changed lint abort on error to false so it's stops messing with travi…

…s CI build

Merge branch 'master' of https://github.com/jd-alexander/LikeButton