Added express-session middleware
Modified a grammar error of the supervisor script
Added attributes for number(min, max)

+ commentSchema.type
+ factcheckSchema.score, factcheckSchema.ref_score.score
Added login test page
Merge branch 'apps/factful' into apps/account
Added passport packages for authentication

+ passport
+ passport-lcoal
+ passport-local-mongoose
Added login.html for testing register and login
Modified accounts/models for passport pkg.
Set passport setups
Added register function with passport pkg.
Added login function.
Added next for login page redirection after login
Added logout function
Just added empty line for readability
Just modified url structures for preventing duplicated urls
Merge branch 'apps/account' into dev