added node.js server to project
removed unneeded things
test
Merge pull request #7 from ZhishenYang/server

Modify README.md
server things changed
Merge pull request #10 from ZhishenYang/server

server things changed,Code review finished! Every thing works fine!
Fixed mongo database schemas
Fixed mongo database schemas
Fixed mongo database schemas
Fixed port number conflict
Fixed add user function in server
Merge pull request #11 from ZhishenYang/server

Fixed some functions in mongodb, fixed port number problem.
Merge pull request #12 from Markko/master

Merge master into server branch
replace cookie with server call

added post request to server, in place of saving a cookie.
changed tag retrieval

Changed getting tags from the cookie to the server. session uername is still stored in a cookie
fixed user tag
modify recommendation.js and survey.js to let cookie exist only 7 days
Merge pull request #13 from ZhishenYang/server

fixed user tag
Fixed server problem, so we can add user and retreive user data from server
Merge pull request #14 from ZhishenYang/server

Fixed server problem, so we can add user and retreive user data from ser...