Moved api to own url /api/v0/* and implementing front-end.

-all API back-end routes is now /api/v0/*
-authentication agains database  [PUT] /api/v0/user/:name/  body:{username: :name, password: 'pwr'}
-Added more views for front-end
-removed obsolete back-end routes (.html related)
-update README.md and testcases