Merge branch 'travis'
Define a license. Fixes #1.
Better description.
Change PostgreSQL user.
Default config values.
Set Rspec as test tool.
Install generator.
Message model.
Import and migrate Dummy app database.
Scopes for Message.
Exchange messages feature.
Notify recipient about new messages.
Update Rails to `4.0.1`.
Scenarios for the messages inbox.
Email preferences for new messages.
Require debugger.
Rails 4.0.1 fixed this.
Fix rules for association.
Fix rules for association.
Merge branch 'master' into travis