Add a Bitdeli badge to README
Merge pull request #2346 from bitdeli-chef/master

Add a Bitdeli Badge to README
Optimize page permissions checking

  * group__users doesn't exist and it wasn't select_related
  * group__user_set is a one to many, we should use prefetch_related
  * has_permission_membership was still running even if has_perm was
    True
Merge pull request #2756 from fusionbox/fix-menu-performance

Optimize page permission checking
Merge branch 'develop'

Conflicts:
	README.rst
	cms/menu.py
basics settings and structure mode placing
cache invalidation fix
pyflakes fixes
Adds ``=id`` to PageAdmin.search_fields
Merge pull request #2961 from digi604/fix-2904

basics settings and structure mode placing
fixes #2965
Merge pull request #2966 from digi604/fix-2965

fixes #2965 (empty title in publish)
Merge pull request #2964 from Chive/feature/page-search-by-id

Search by exact id in Page Admin
fixes js button switch
Merge pull request #2967 from digi604/fix-2904

fixes js button switch
fixes partially #2939
Merge pull request #2968 from digi604/fix-2939

fixes partially #2939
adds language tabs on page creation
fixes issue #2925
breadcrump working again