Add gradle and IntelliJIDEA stuff
Add Apache License files
Merge pull request #7 from mkalb/gradleStuff

Gradle stuff and license files
Minor updates in Tuple2d/Vector2d
Added Tuple3d and Vector3d
Cleaned Tuple2d tests
Added tests for Tuple3d and Vector3d
Merge pull request #10 from msteiger/vector3d

Added Tuple3d, Vector3d and ImmutableVector3d