Merge pull request #19 from ksrikanthreddy/master

Issue #18: Add new chat icon.
Merge pull request #21 from ksrikanthreddy/master

Added autofocus directive and enter click directive.
Merge pull request #22 from ksrikanthreddy/master

added autofocus using focus directive.
Contacts Page added.
Merge pull request #23 from bmadhu/master

Contacts Page added.
Added MongoJS.
Added body-parser.
Saved mobileNumber when validated OTP.