Add:
1. Built-in QSPluginManager, now quickshop can use this to calling listener registered in Bukkit so we can tracking which one plugin cancelled our event.
2. New language support : Spanish (Latin America)

Fix:
1. Set nothing drops in our custom BlockBreakEvent, make sure other plugin don't process the event incorrectly.
2. Set name invisble for our display item, solve the holo name a mess issue, Thanks a lot @LoneDev
3. Fix NullPointerException when we cannot find matched shop type, (WTF, modifyed database by user?), anyway, now will set to SELLING by default.

Changes:
1. Reserve nolonger compile to in QuickShop and now it is provided, you must install Reserve plugin to use Reserve.

Clean:
1. Removed useless imports and comments.
2. Removed useless compiled libs.
3. Removed useless code.
4. Improve the some method code, now should faster.