More asserts

Added a couple more PhpUnit assertions, the goal is that all PhpUnit ones have a Verify counterpart. 
Well, they are as specific as PHPUnit is, no more, no less. To me, it's weird to have a library that allows you to have SOME assertions but not all. I had run into situations where I needed some PHPUnit function that wasn't in Verify and had to have half the test in one style and half in the other, which is why I decided to add the remaining ones. I understand your point, I will probably never use some of them, but I thought it would be nice to have parity with PHPUnit.