New "simplemail" adapter for Griddler

I added a new mail adapter 'simplemail' to Griddler. This adapter provides an easy way of posting HTML forms data or JSON messages to an RAILS application. 

IMO this can be useful to test applications locally and also as an alternative to all the other Mail Services. We currently use this add-on together with a (perl) script on one of our servers and simply forward incoming emails to an RAILS app as HTTP / JSON posts ...