GList Implementation
GSTUDIO_TASK_TYPES variable added [Bug, Feature, ...]
Added new RelationType: Task -- has_type | is_type_of -- GList
Code added to save GList's GSystem(s) for GList TaskType (site-wide using GSTUDIO_TASK_TYPES)
jsonify() [M]: Parameter passed 'NodeJSONEncoder' to json.dumps() that helps in parsing ObjectId and datetime values.
create_grelation() [M]: Bug fixed: In few cases, was not updating node's relation_set field
get_group_member_user() [M]: Now returns details of members of the group in dictionary format
Code added to update object_value of Assignee GAttribute(s) to list of primary keys
Task-Type Implementation
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit-amn-dev
Merge branch 'task-type-impl' into mongokit-amn-dev
Update requirements.txt

bug resolved while installing pillow package
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit-amn-dev
Bug fixed: In Upload Task-files parsing and listing Watcher's names
Excluded creator of the task from the list to whom notifications to be sent.
Merge pull request #924 from AvadootNachankar/mongokit-amn-dev

GList & TaskType Implementation
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit