threadsafe headers
Ensure belongs_to finder method sends a non-nil key
Add belongs_to tests for nil finder key case
Merge pull request #61 from niedfelj/threadsafe_headers

threadsafe headers
Merge pull request #68 from jassa/fix-belongs_to

Ensure belongs_to finder method sends a non-nil key
Bump rails-observers required version
Merge remote-tracking branch 'upstream/master'