Fill in form action attribute in user_detail.html.

Using Chrome, the update form didn't submit with a blank action, but worked fine once I specified it.

Also, in researching whether a blank action attribute was OK, I found out that according to the HTML5 spec, the action attribute "must have a value that is a valid non-empty URL potentially surrounded by spaces."

http://www.w3.org/TR/html5/forms.html#attr-fs-action
Inspired by @natea, Make the deploy to Heroku instructions nicely formatted and EMAIL_BACKEND default
via @natea fix a missing cookiecutter prefix
via @natea set the python path in the procfile, and use foreman to start the server
via @natea since the settings.py file is nested inside the config/ dir, we need to go up one directory to find the static files
Merge pull request #28 from toffer/patch-1

Fill in form action attribute in user_detail.html.
Update CONTRIBUTORS.txt