COOPR 542: Add ability to configure UI to use TLS

SSL/TLS implemented for coopr-ui.
It would not. NodeJS evaluates environment variables into string values, so this check is correct. Moreover this check would work correct in case when environment variable is not set at all.

The only thing should be corrected there is '|| false'.

http://codepen.io/anon/pen/gCKny?editors=101