changes in file.py
improved find query to fetch video
Merge pull request #307 from supriyasawant/mongokit

changes in file.py
Improvement in designer app module
1)data of app will be stored acording to group
2) data of app will be displayed acording to thier group in which they created
Merge branch 'mongokit' of https://github.com/gnowledge/gstudio into mongokit
Merge pull request #308 from krishna31/mongokit

Improvement in designer app module
Merge branch 'mongokit' of https://github.com/AvadootNachankar/gstudio into mongokit-dev
Changed key from modified_by to contributors and added new key as modified_by
Replaced modified_by by contributors
Code added/modified to save modified_by and contributors fields accordingly
Merge branch 'mongokit' of https://github.com/AvadootNachankar/gstudio into mongokit
Merge branch 'mongokit-dev' into mongokit