This only works for admin users

Dates with colon offset like "2018-03-12T10:16:46+07:00" threw a DateTimeParseException, changing the order of the offset patterns fixes this

* Added ```withShared()``` to ```GroupProjectsFilter```
* Cleaned up Javadocs for ```withIncludeSubGroups()```

Added fields: 
 - allow_collaboration
 - allow_maintainer_to_push
 - closed_at
 - closed_by
 - discussion_locked
 - merged_at
 - merged_by
 - task_completion_status
 - time_stats
Renamed fields: 
 - merge_when_build_succeeds to merge_when_pipeline_succeeds