Adding tables with Backref
Updated .gitignore
Merge branch 'ShruthiChari-master'
Merge pull request #9 from ShruthiChari/master

Added Backrefs to existing models.py
Update README.md

Added contributors.
Merge branch 'master' of https://github.com/pesos/ngo-portal
Changed backrefs and added user-organization relations.
Merge branch 'master' of http://github.com/pesos/ngo-portal

Conflicts:
	src/core/models.py