Mail chimp

I added in two welcome emails: one for vendors & one for foodies.  These are triggered upon registration without facebook.  I used Mail Chimp to create the templates and the Mandrill API to send them.  The keys for our mandrill are directly in the code, but this isn't a security risk because they are only allowed to send pre-existing templates with them.  So the worst they could so is send some welcome emails to ppl they know, so let them do some free advertising for us :)

Don't forget to `bower install mandrill-api`
Same comment as above: Can we save the key in some environment variable and fetch the env variable here?