Merge pull request #4 from galaxode/master

Added a texture to environment
Fixed a wrong calculation for g(n) value
Revert 93546b7..a84b536

This rolls back to commit 93546b7871bcb105524ac254bb69d5f5c8c44b24.
Not committing
Merge pull request #5 from galaxode/master

Added Some Collectible Items
Revert f2c1e10..22a72a0

This rolls back to commit f2c1e1058f2fe9e5471557a38b04c5b0326e41f9.
Added particle effects for gems
Merge pull request #6 from madrusec/master

Pull over changes