[BUGFIX] Update isRegionProtectedFromBuild() WorldGuard

* Re-organised Imports
* Update Korra to use WorldEdit 5.6.3 and WorldGuard 6.0.0 beta 2 (Allows for a version 5.x.x fall back)
* Addresses [Bug Report](http://www.projectkorra.com/threads/bending-error.586/), [ErrorLog](http://pastebin.com/B95ESqw5), [Bug Report 2](http://www.projectkorra.com/threads/error-when-firebending.596/)

Situation, sk89q reworked his WorldGuard API deprecating some methods (Not the big problem here) but he changed the way the methods were implemented (Hence breaking our checks).
This Pull Request addresses the issue and patches it as well as allowing the old check to work for older versions of WorldGuard