Mocha v3 support

[paulfalgout]

It looks like mocha 3 may not be supported. This #179 might fix it, but what I'm seeing is only the passing test stat is getting recorded and all other values are showing up NaN This means if a test fails, it doesn't fail the run.

[AlexanderOMara]

Mocha v4 also seems to be non-functional, as I just discovered while attempting to setup some Mocha unit tests.

[mohitmun]

@AlexanderOMara Mocha v4 is functional. Can you provide me more details on what broke when you were trying to setup tests?
One issue which I figure was with url.js. we use this repo to conduct integration tests. testing url.js against mocha 4 would report zero tests passed. this is because url.js has some node runtime check

if ( typeof require == "function" )
{
	var chai = require("chai");
	var url  = require("../url");
}

which would conflict with Mocha v4(as it had function named 'require' defined in it). when removing above check, it started working as expected.
I also tested against v3 and v5. checked again all minor and major versions.
Correct me if I have missed something.

Closing this issue for now, reopen with more details if issue persists.