Change class to non-static and remove a whole bunch of characters

Shortened it quite a bit by:
* Make the function non-static. It means the user has to make an instance, but you save 14 characters.
* Use $_ENV instead of getenv(). Saves 2 characters.
* Use concatenation of keys rather than a two-dimensional array. Saves 2 characters.
* Make function name for running the router false() instead of _(). Saves 5 characters.