CB-6811 Add license to CONTRIBUTING.md
Implemented vibrateWithPattern (for android) and adapted documentation.
Extended vibrateWithPattern to allow for pattern repetition, implemented a complementary cancelVibration function and adapted documentation.
Github close #11
updated notice file
CB-6877 Updated version and RELEASENOTES.md for release 0.3.9
CB-6877 Incremented plugin version.
Merge branch 'master' of https://git-wip-us.apache.org/repos/asf/cordova-plugin-vibration