Prevent default when clicking the app menu tab
User can support a vision

- Add un/support methods to User model
- Handle clickingn of the support link
- Change the logged in user to a UserModel instance
Update version of django-jstemplates and register templates as partials automatically
Rerender support summary when supporter list changes

- Add a template partial for support summary
- precompile handlebars templates when Django renders them
- handle collection change events in SupportListView
- change the total support count when the support count link is clicked