Fixed Crash on Rift Removal

Fixed a crash from manipulating rift data on the client side. I let this
happen because it seemed like TileEntityRift already did that before.
This crash also exposed another issue: that server-side functions are
being used on the client side. I'm not sure how pervasive this is but
some client dimensions are being constructed with the server-side
constructor.
Merge pull request #179 from SenseiKiwi/master

Fixed Crash on Rift Removal