Updated tests and example to use new API, app.mailer or res.mailer;
Fix for API change;
Added unit test for app.mailer object;
Cleaned up app.mailer.send tests;
Added initial app.mailer.update test;
Added tests for app.mailer.update;
Added mailer.update funcitonality;
Added spec test for app.mailer.update;
Fix incorrect test name;