Merge pull request #33 from ciudadanointeligente/dev

Dev
Creating test for plugin
Starting sending a message
Adding travis config
Merge pull request #35 from ciudadanointeligente/mail_plugin

Mail plugin
Testing with travis
Fixing settings to load database from settings.py
Adding build status to README.md
coveralls configuration in travis.yml
Adding configuration for running coveralls
Adding coverage badge for README
Testing get_absolute_url in writeit instances
Testing that when a message is sent it is done using all the channels available (plugins)
When the message is sent it is also sent using all available channels
Adding mail plugin
Adding travis and coverall modifications for the new app mailit
basic structure of the mailing plugin
Basics of sending an email
Adding message Record migration
Sending email with template in subject and content