Notification plugins - Added SMS plugin and Mandrill email plugin. Added one log statement.

Hi,

I added some plugins that I wanted to contribute back to the main project. I based them off of the default mailer plugin. The SMS plugin uses Plivo, and the Mailer uses Mandrill. They are services that have Node modules and are very cheap (Mandrill is essentially free and but provides more tools than Amazon SES). 

I also added a log statement about the config file because it is nice to know for sure what config file is in use! It can save some costly mistakes!

If you have any concerns about the code let me know and I'll fix them up. 

-Aaron