The vendor directory is now just composer stuff. Planning to rearrange some
files soon but wanted to commit these changes. AYAH is now installed via
composer from a package I am maintaining and I dropped the test helpers as it
is a dev-only requirement (and that's assuming you even want to test).
Also fixed a few minor bugs and reworked Browser class to not use the constant
UNIT_TESTING so I could get the class to 100% coverage. Adds a dependency of
testing_helpers which I believe is available on Travis CI by default. Up to 75%
coverage, w00t w00t!
