Merge pull request #923 from Prototik/dev

Fix Travis config
Fixed typo in release date
Fix link to samples in repo.
Merge pull request #933 from UweTrottmann/patch-1

Fix link to samples in repo.
Add Gradle build.
Merge branch 'ChristianBecker-master' into dev
Update Robolectric 2.0 to final release.
Fixed MenuItem NPE. Closes #902.
Merge pull request #955 from yanchenko/902_fix

Fixed MenuItem NPE. Closes #902.
Update android-maven-plugin version to 3.6.0

fixes JakeWharton/ActionBarSherlock#960
Merge pull request #961 from PR3x/patch-1

Update android-maven-plugin version to 3.6.0