Merge pull request #23 from bmadhu/master

Contacts Page added.
Added MongoJS.
Added body-parser.
Saved mobileNumber when validated OTP.
Merge pull request #24 from ksrikanthreddy/master

Added MongoJS.
Merge pull request #25 from bmadhu/master

Add New contact page added.
Saved new Contact.
Get all list of contacts.
Merge pull request #26 from ksrikanthreddy/master

Saved new Contact.
Get Contacts list join with user to get the photo of the contact.
Added dropdown menu for each contact to chat/Delete contact.
Added default profile image.
Merge pull request #28 from ksrikanthreddy/master

Get Contacts list join with user to get the photo of the contact.
Fixed: validating contact number with User id.