Merge pull request #36 from felipecsl/master

Updates gradle plugin dependency
Merge pull request #37 from felipecsl/master

Uses latest gradle plugin version
Update Android SDK platform to 21
Merge pull request #39 from friederbluemle/update-project

Update Android SDK platform to 21
README nitpicking

`debug` and `release` are build types, not flavors, although this might seem a bit pedantic.
Merge pull request #40 from aried3r/patch-1

README nitpicking