add session based authentication for rpc

[vaishnavachath]

• used express-session middleware to handle the session(added as dependency)
• used basic-auth to handle authentication(added as dependency)
• modify the startclient to send cookie data
• modify the startServer to accept credentials
• tested both from browser and via node, works well

also add some comments for previous modifications made

[coveralls]

Coverage increased (+13.6%) to 59.372% when pulling 118f3e98548aa0ebd76d63a1cb69ef651f38c9fc on vaishnav98:master into 481525c5d472fba8355074563380c803c38c2c62 on jadonk:master.

[jadonk]

The coverage check should be considered a requirement now. We have a lot of untested code, so it shouldn't be hard to increase the coverage %.

[vaishnavachath]

Sure, I will concentrate on increasing the coverage too when making the modifications