[new] www/geckodriver

Hi!

Here is a port of Mozilla's geckodriver.

geckodriver is a "proxy" that allows W3C WebDriver compatible clients to
diddle Gecko-based web browsers.

It lets one use things like Selenium to test web pages in an automated way.

I went back and forth on adding www/mozilla-firefox as a RUN_DEP.. This port
doesn't have it.

DESCR:
Proxy for using W3C WebDriver compatible clients to interact with Gecko-based
browsers.

This program provides the HTTP API described by the WebDriver protocol to
communicate with Gecko browsers, such as Firefox. It translates calls into the
Firefox remote protocol by acting as a proxy between the local- and remote
ends.

Clue sticks? This is my first rust port.

Cheers,
Aaron

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