[Fix bug 740990] Allow plus sign in skills
[docs] Update elasticsearch info.
Focus on search when 's' key is pressed
[Fix bug 977557] More documentation on installing pre-reqs for development
[docs] Specify an elasticsearch version.

Apparently versions >0.90 don't work. Specifically instruct developers
to download version 0.90.10 which works and it's the same currently
installed in our servers.
[fix bug 978694] Count hits to API Resources.
Fix bug 948041 - "Is basket working?" management command

New command is "manage.py check_basket"
Merge pull request #837 from glogiotatidis/978694

[fix bug 978694] Count hits to API Resources.
[fix bug 969039] Change moderated group's join notification.
Merge pull request #835 from caktus/977557-document-requirements

[Fix bug 977557] More documentation on installing pre-reqs for development
Merge pull request #793 from caktus/740990-plus-sign-in-skills

[Fix bug 740990] Allow plus sign in skills
[bug 916800] Register auth.Group to Admin Panel.
Merge pull request #841 from glogiotatidis/916800

[bug 916800] Register auth.Group to Admin Panel.
[fix bug 970806] Switch to users.UserProfile instead auth.User in Admin Panel.

Since all of our models that relate to users link to UserProfile, make
the later the entry point for user profile edit in Admin Panel. This
allows us to inline models like GroupMembership which couldn't be
inlined within User.
[fix bug 974011] Fix logout button in Admin Panel.

Because we're using BrowserID we need to redirect users our custom
logout view to properly sign them website and delete the BrowserID
session.

At the same time this fix solves the 500 error that was raised when a
user clicked the logout button from the admin panel, which was due to
'registration' app not being excluded from Jingo.
Merge pull request #840 from glogiotatidis/974011

[fix bug 974011] Fix logout button in Admin Panel.
[Fix bug 969116] Updated email sender and signature.
Merge pull request #842 from glogiotatidis/admin-userprofile

[fix bug 970806] Switch to users.UserProfile instead auth.User in Admin Panel.
Merge pull request #839 from venksv/b_969116

Fixed bug 969116 - Update email sender and team signature for email noti...
[docs] Add PIL/freetype note for Mac OS X