Merge pull request #810 from kedar2a/mongokit-explore-resources

Changes in Data-Review, settings.py and additions in requirements.txt files
Setting system's default encoding as 'utf-8'
Bug resolved: member_of_names_list() function modified - Look for 'gsystem_type' field only if this key exists
Updated to fill attribute_set & relation_set fields of all existing GSystems.
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
Merge branch 'mongokit' of http://github.com/gnowledge/gstudio into mongokit-explore-resources
Merge pull request #811 from AvadootNachankar/mongokit

filldb script updated to fill attribute_set & relation_set fields
check userpreference modified
Merge pull request #812 from anujag/mongokit

check userpreference modified
forum view modified to check nonetypes
Merge pull request #813 from anujag/mongokit

forum view modified to check nonetypes
Merge branch 'mongokit' of http://github.com/gnowledge/gstudio into mongokit-explore-resources
Data Review: Enabled editing only one row at a time