setting custom room to an empty string whenever a custom location is used.
email pre-fill within bldg services request. Made a new property on MITTouchstoneController to provide emailAddress of a signed user.
Make sure to handle server errors
Adds an assertion macro which provides a parameter for the object passed to NSAssertionHandler

This resolves the issue of the default NSAssert maintaining a strong reference to self;
Remove the unused AFNETWORKING_20 #defined code and clean up the set completion block method
Merge pull request #55 from MIT-Mobile/3.5-dev-yev-email-prefill

Pre-fill contact email on Building Services form if user has already saved their username for Touchstone #50
Merge pull request #56 from MIT-Mobile/3.5-dev-yev-news-headers

Fix for "Make MITDisclosureHeaderView's background dynamic #49"
nil checks
Merge pull request #54 from MIT-Mobile/3.5.-dev-yev-bugfix

Fix crash in Building Services #51