Support for Mocha

[toolmantim]

[clok]

We would use this at @better

[mariovisic]

It seems like mocha may not support having multiple reporters out of the box which may make it a bit tricky.

@clok do you have a way of running multiple reporters on mocha in any of your test suites?

[mariovisic]

draft PR up with an implementation #33

[rmagrin]

The PR #33 was merged, but the mocha reporter files were not added to the npm package. I create a PR to add them to the npm package: #45

[KatieWright26]

PR #45 was released in #55, version 1.4.2