Add basic transaction functionality
Add basic transaction listing
Add migrations for transaction, transaction listing
Add model method to create reserved date
Add model method to create transaction listing
Add routes for transactions
Add ability to create transaction to UI

TODO(marco): change this when you work on transaction UI
better search, can now accomodate a missing start or end date
added another search filter for space. Also returning listings instead of location
refactored search into models
Move conversation getter to model
Add request_submitted column to convos
Flag conversations when renter initiates transaction
s
Merge branch 'master' of https://github.com/6170-sp13/teamchill

Merge
delete scaffold CSS generated by Prabhav