Created Skills

1. Created skills.py. In the future all abilities coded, or skill
related methods will go into here.
2. Moved code from mob_factory to skills.
3. Implemented the code from echoing_shards into skills.
4. Deleted echoing_shards.py
Cleanup from creation of skills.py

1. Moved SKILL_DB into skills.py
2. Cleaned up mob_factory to comply with the above change
3. Modified mob_factory.py to comply with the above