Merge branch 'hotfix/task-edit-user-list'
Merge branch 'develop' of github.com:SourceKettle/sourcekettle into develop
Merge branch 'develop' of github.com:SourceKettle/sourcekettle into develop
Merge branch 'develop' of github.com:SourceKettle/sourcekettle into develop
Tidied up drag and drop; update jQuery
show autogenerated gravatar for users; show 'unknown' image for tasks not assigned
Added more descriptive error messages to AJAX requests, remove restrictions on task status changes
Finished improved milestone drag and drop