probable bugfix for getHeaders() method, deprecated method update for android-library plugin, static package name definition fixed, and other lint optimizations..
Merge pull request #12 from zeplin/feature/lint_check

lint error/warning fixes :thumbsup:
Merge branch 'develop' into feature/maven_central_upload

Conflicts:
	rally-lib/build.gradle
Merge branch 'feature/maven_central_upload' of https://github.com/zeplin/rally into feature/maven_central_upload