Grunt for saucelabs CI tests (and local server).
Testing travis CI matrix exclude.
Testing travis CI matrix exclude (take 2).
Testing travis CI matrix exclude (take 3).
Ignoring vendor directory and .env file.
Merge branch 'master' into feature/expectations

Conflicts:
	minitest.js
	test/index.html
Simplified grunt tasks.
Merge branch 'master' into feature/expectations
MT_NO_EXPECTATIONS variable to skip the infection.
Fixed matchers, thanks to some basic tests.
Simple test suite for expect().
Support for matchers in Internet Explorer 9.

IE9 supports Object.defineProperty but sadly has a bug with number
primitives, where this in a getter would always be 0, which makes
matchers useless when working with numbers in IE9.

But! We can (almost) safely extend Number.prototype with a method,
and thus use that method to overcome the above limitation.

And it works.