Updated the spawn system and added new waves
2014-05-11
-FEATURE: Added the WarpIn effect.
-FEATURE: Added WarpWaves.

2014-05-03
-FEATURE: Wave randomisation starts at wave 5, before that only regular
waves are created.
-FEATURE: Special waves occur every 5 waves, counting from 10.
-FEATURE: Added special waves.
-CODE: Migrated EnemyData to a separate file.
-CODE: Moved the sub-classes of Wave to komposten.leap.spawn.waves.