Fix a problem with re-saving deleted objects in a spec in postgres, add postgres to test group in gemfile

It turns out find_for_database_authentication calls find_for_authentication, not the other way around.

Revert "Revert "Revert "remove uploaded test images after running the specs/cucumber"" -- using == now instead of ="

This reverts commit b11bd23d.

Revert "Revert "remove uploaded test images after running the specs/cucumber"" -- using == now instead of =

This reverts commit 7969b520.

This reverts commit a6eb275c.

MS DG IZ major invite refactor. all tests are green minus weird stuff on dans computer, need to checkout this out on pivots

Bad solution for making sure that an invited facebook user is marked immediately as having been invited

Put a select limit on the person query on contactsController index, since we know exactly what we're doing with the data

Fix 500 on invitations new on unknown facebook user... bad solution, maybe we should just delete the offending invitations?

Make resque job specs specific about what error should be raised; fix expectation on hoptoad notifier

Fix errors when trying to mail comment notifications to post authors on posts other than status messages