Redirect mobile devices
Buttons now visible in login when cas & shibboleth are activated
Replaced CAS and Shibboleth by their names + logo override in oae.base
Follow-up on CAS and Shib buttons
Merge branch 'newframework' into discussions
Merge branch 'discussions' into mimeTypes
Merge pull request #2828 from Coenego/patch-2

Redirect mobile devices
Proxying host header to etherpad as socket.io needs it do a handshake.
Merge branch 'newframework' into discussions

Conflicts:
	nginx.conf
Merge branch 'discussions' into mimeTypes