temporary_invitation 5.x-2.0-rc7

Fix the redirection issue once and for all. There's only one "delete" menu path now that works with the "destination" attribute, which should perform a tad better and enables better usage of the temporary_invitation_overview() function for themers.

I think this will be the final 5.x-2.0 version, I'm really satisfied with it now. If no further bugs show up, I'll re-release this as 5.x-2.0 in the next few days.