Added a configuration extender utility. Any configs defined in
config-local.js will overrite defaults. Added Plivo SMS plugin. Added
Mandril mail plugin.
Changed debug message to SMS
Added debug routes for plugins.
Reversed my changes to config system and added a log message to say what
config is in use.
Removed unused ignore
Merge pull request #251 from a-r-d/master

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