Fixing .gitignore and removing artifacts

Like IDE artifacts and gradle build artifacts.
Merge branch 'master' of github.com:cogmission/copic-j into cogmission-master

Conflicts:
	.gitignore
Merge pull request #1 from rhyolight/cogmission-master

Fixing .gitignore and removing artifacts
Added 3 complex tests of getNeighborsND from the original Python unit
test.