Making the flask app more aware of the angular routing.

Added a wildcard url route to app/* to allow users to navigate
directly to pages in the angular app. Previously, the flask app
responded to a 404 if the user specified a URL other than the
index.
Merge pull request #21 from DavidEBest/devel-flaskangularrouting

Making the flask app more aware of the angular routing.
Merge branch 'master' of github.com:18F/afsbirez into devel-workflows
Adding sidebar support to the workflow directive.