Merge pull request #374 from glogiotatidis/714799

[fix bug 714799] Never cache group view page.
Merge pull request #373 from glogiotatidis/764183

[fix bug 764183] Remove bulk delete from User in Admin Panel.
Updated virtualenv docs with non-404 link to elasticsearch 0.19.4 download
Merge pull request #376 from lmorchard/elasticsearch-venv-moved

Updated virtualenv docs with non-404 link to elasticsearch 0.19.4
[fix Bug 690591] Include links to bugzilla and github in footer
Merge pull request #375 from Sancus/footerlinks

[fix Bug 690591] Include links to bugzilla and github in footer
[fix bug 748559] Change group url to /group/<url>.
[fix bug 832968] Make group.url unique with AutoSlugField.
[fix bug 763513] Redirect GroupAliases to parent Group if exists.