Install mailboxer gem
Add acts as messageable and helper method required by mailboxer
Link I'm Interested button to controller action to send message of interest
Add route for conversations#im_interested
Configure mailboxer to not send notification emails
Add feature spec for replying to listings
Add spec for viewing insterest messages
Change link to form messages
Change partial to shared/home_nav
Add route for messages index
Add partial for messages
Bring over messages index from temp views
Add devise helper methods
Bring in conversations controller from mailboxer demo app
Add messages controller
Add message view specs
Attach search button click handler to a unique id
Add show action and notes on mailboxer
Bring over im interested action from conversations controller
Add reply action for ajax message reply