Linkify the reference to the project in the notification emails footer
Linkify the reference to the project in the notification emails footer

Rationale:

* Consistency: the link is always at the same place.

* Streamlining: it allows to remove the header banner, now that the
project url can be accessed from another place.

8thcolor/eurucamp2014-htdsadr,8thcolor/rubyconfau2015-sadr,8thcolor/rubyconfau2015-sadr,8thcolor/rubyconfau2015-sadr,8thcolor/eurucamp2014-htdsadr,8thcolor/eurucamp2014-htdsadr