Add link to jenkins job from service-checks dashboard

*  Minor ui change is here:
https://github.com/AJamesPhillips/cabot/commit/82546b1620e71626b77b15ab8dd6e10d44cca95f#diff-250c9d8a85df6692f8cd121060b0554eR111

*  I could only get tests to pass with imports of the form `from app.cabotapp...`, instead of `from cabotapp...`  (including the patch functions).

*  Should work on Mac OSX too but needed to upgrade the `distribute` python package.