Add Gradle wrapper v.2.1.
Do not put IDE specific files under version control.

+ You need to re-import the project once since the file is deleted here!
Update Gradle build file - fix deprecation warnings.
Exclude root "build" folder from version control.
Merge pull request #37 from johnjohndoe/update-project-setup

Update project setup
* add code snippet to be able to export all internal libs for the wiki