Adds a user agent string to the login request to bypass 403 errors.

I found that Log.log wouldn't work with MagicMirror versions prior to v2.12.0. I have tested this change with v2.11.0, v2.12.0, v2.13.0, and v2.14.0 and the debug function now uses Log.log or console.log if Log.log is not availabe.

First full functional release