Merge branch 'master' of github.com:humhub/humhub

Fixed exif error

Increased version number to 0.10.1

Updated_by and created_by are always same value. humhub#300

Improved usability and reduced ajax calls for HEditorWidget

Fixed notify users broken on user profiles (humhub#247)

Updated version to 0.9.1

Changed version to 0.9.0

Changed Verison to 0.9.0-rc.2

Readded auto updated_by / updated_at Handling