Sorting of contenttype in backend

Patch suggested by trigau in #948
Err on the side of caution and compatiblity for & vs &amp;
Bump version for good practise
Merge pull request #1128 from GawainLynch/hotfix/Socialite

Err on the side of caution and compatibility for & vs &amp;
Merge pull request #1127 from rarila/patch-1

Sorting of contenttype in backend
Fixed: main menu should reflect actual user permissions
Bumping version to 1.6.0 RC