add support for flavor groups and grouped Tests

add flavor groups to example

fix style issues

Update README test report path

Update support library version string

Attach the test resources directory to the build

fix "No such property: plus for class: org.gradle.api.internal.file.UnionFileCollection" error

add multi-flavor testcases

add path to flavor specific tests (testFree, testBeta ..)

tests for releasType Flavors only

style and comment fixes