Merge pull request #3 from applico/dev

Dev
Merge pull request #4 from applico/dev

Adding support for xxhdpi and tvdpi
Merge pull request #5 from applico/dev

Change to support user not setting a drawable
Merge pull request #6 from applico/dev

Dev
Merge pull request #7 from applico/dev

Dev
Update README.md
Update README.md
Merge pull request #8 from applico/master

Readme