Unit tests

[jbboehr]

I've written some basic unit tests, as I've been looking into using HHVM for some projects and wanted to verify basic operation.

For code coverage, I didn't cover excluding/not excluding media queries as it didn't seem to do anything either way. It seems like the CssSelector to XPath converter doesn't support media queries. The formatting changes to the specificity chunk loop were made because it was confusing the code coverage analyser. Aside from that, there is full superficial code coverage.

The library was fully compatible as-is with HHVM 3.1, except for an inconsistency in the uksort, so I made the sort function compatible. See facebook/hhvm#1781

[barryvdh]

Cool :)
I refactored the specificity in #59 which should solve the HHVM issue, right? (And also improve some other points).

Once this and that one is merged, I'll also add some tests to the specificity functions.

I think the CssSelector skips mediaqueries, because it can't handle them anyways? You can't inline mediaqueries.

[barryvdh]

I think you could also set bootstrap="vendor/autoload.php" in your phpunit.xml, so you don't need another bootstrap. The classes are autoloaded.

[jbboehr]

@barryvdh It makes sense to exclude media queries, I just wasn't sure if I was missing something as there's an option called excludeMediaQueries. You could potentially support inlining css within media queries based on a particular device profile.