First cut connector extra details

Moving extra details for a connector (i.e the tender api / key) to a
dictionary style array on the user object.
Start of secret creation.
API mapping +secret webhook url

+ commenting on an event + gravatar package change
Gravatar package cleanup

Changing the rest of the connectors to use the gravatar package over
node-gravatar
Basic Tender message formatting

Adding some more formatting to the Tender message along with a link back
to the support discussion.