Update basket only when functional area memberships change.
[fix bug 908053] Fix group member counts in admin.
Add GroupManager that provides member_count.

* Also add total_member_count, full_member_count and
  pending_member_count in Admin Panel.
Beautify GroupAdmin.
[fix bug 980887] Speedup group browsing.
[fix bug 1000938] Proper filtering for group memberships.
Tests cleanup.
[Bug 918115] fix tooltip JS to be mobile friendly
Merge pull request #940 from Sancus/tooltipfix

[Bug 918115] fix tooltip JS to be mobile friendly
Fixes #1005221: T-shirt tooltip does not display on iOS
transition removed from visibility css property. made tooltip thinner to fit on iOS.
all transitions are faster.
prevent default touch event
Merge pull request #941 from caktus/1005221-ios-tooltip

Fixes #1005221: T-shirt tooltip does not display on iOS
Add django-import-export and dependencies.
[fix bug 980138] Display total number of results found for a search
Merge pull request #922 from glogiotatidis/groupscleanup

Groups cleanup
Merge pull request #939 from matjazv/980138

[fix bug 980138] Display total number of results found for a search
[fix bug 1003875] Add Discouse to external accounts.
Add django-import-export support to admin panel.
Merge pull request #936 from glogiotatidis/importexport

Add django import-export.
[fix bug 1007567] Reset vouch metadata when is_vouched=False.
Merge pull request #943 from glogiotatidis/1007567

[fix bug 1007567] Reset vouch metadata when is_vouched=False.