[#580] Replace User.get_profile()

User.get_profile() is removed in Django 1.7. Fix by adding
related_name="userprofile" to UserProfile.user field and replace all
calls to get_profile() with the related name.
[#580] Replace ugettext with ugettext_lazy

Django 1.7 complains about using ugettext on the module level. Fix by
using ugettext_lazy instead.
[#580] Remove misplaced call to ugettext_lazy

The related_name attribute of Benchmark.project was set to be
translated which is no good. Remove translation call.
[#580] Remove permissions_tags loading

The Permissions app is removed and this reference was missed.
[#580] Fix import of patterns and url

django.conf.urls.defaults does not exists any more, import from
django.conf.urls instead.
[#580] Update 2_rsr.txt with fixed dependencies

Change to Django 1.7b4

A number of our dependencies need fixing to run Django 1.7. There are
now forks under github.com/akvo for those with fixes.
[#580] Code cleanup

Remove unused imports and commented out code.
Merge pull request #600 from akvo/feature/du580_fixes_to_run_1.7

[#580] fixes to run 1.7