Merge pull request #18 from technicalcycling/master

actually set mOval from constructor param in RoundedImageDrawable
update gradle wrapper and android plugin versions
Refactor api for clarity
add gradle sources to wrapper
update readme with Changelog, remove Known Issues
update readme to reflect LayerDrawable support
update usage to reflect latest version number
can't get pom packaging to work... changing readme for now
build tools 0.6
fixed artifact packaging containing "aar.asc" ext
update to gradle 1.8
make RoundedDrawable public, closes #23
add better support for setImageResource
add setDither and setFilterBitmap methods for #26
version bump and readme update for 1.2.0 release
remove @
update build tools and gradle, fix sonatype credential undefined errors
default scaletype to FIT_CENTER and never null, fixes #27
bump to version 1.2.1
Update README.md