Permissions and Multiverse Fixes

Removed Multiverse-Core, Multiverse-Portals, and MultiInv in order to
remove Creative mode from the game.

Ensured that the config.yml for PermissionsBukkit was accurate and
complete. Added various basic Essentials commands for default group.

Removed EssentialsAntiBuild.jar and EssentialsProtect.jar to try and fix
the issue with players being unable to interact with objects.

Removed Roboashy from ops.txt.

Added a whitelist with all players who can access the server (prpld
accounts) and admins (Sigurre, BraveNewWorld78, and killerbean0)

Set whitelist to 'true' in server.properties.