Optimization of itemMeta manipulation
cosmetic changes in GemInteractListener
Updating documentation and fix some errors
The now default max level is 170
fix typo in 0.3 change log
Improve issue 16: No animation when picking up gems 
http://github.com/marex-git/gemXp/issues/issue/16

Improve this issue by making the pick-up events only happening on filled
gems
fix inventory event need to handles only filled gems

Relates to issue 17: Crafting a gem with shift clicking 
http://github.com/marex-git/gemXp/issues/issue/17
fix lores not being applied
Update doc for filled_appearance
Preparing release 0.3.1
Updated README for 0.3.1 release
Fix issue with resetting name and lores
Improved warning about problematic filled item IDs