Updated API to v2.1.1 and fixed some top10 issues

Changed dependency checking to WE 5.5, WG 5.9 and Vault 1.4

Making USB work on Bukkit 1.7

uSkyBlock-api named without version number for GitHub deploy

official api jar for 3rd party integrators

Added Metrics to the plugin again rlf#159

official api jar for 3rd party integrators

Changed wording of the item-picup prevention rlf#157

Initial public API

Hotfix of challenges (regression bug rlf#168)