TODO: add a contact form inline here.
removing fabric deploy that's only specific to our infra
updating experiment configuration
- adding django-contact-form to replace contact form
- linking to font awesome from bootstrap cdn
- fixing ADMINS tuple

--HG--
rename : vcweb/core/templates/contact.html => vcweb/core/templates/contact_form/contact_form.html
reformatting page
removing local fontawesome in favor of CDN
minor tweaks to the contact form and contact form sent templates
minor hygiene
- removing CommonsUser.institution_username in favor of directly setting User.username
- refactoring ExperimentMetadata.objects.bookmarked() to return QuerySets
- making namespaces nullable to distinguish "shell" experiment metadata objects that are only used by the subject
  recruitment module
fixing experiment metadata namespace validity check
refining feature list