Merge pull request #25 from eshao/eshao-verparse

FIX: Browser version parsing when only 'latest' specified
1.0.8
handle error from browser.init

If saucelabs cannot init the browser, make sure to capture that error.
dead code removal
FIX: Use webdriver-specific endpoint to query for supported browsers

The previous endpoint will sometimes erroneously report
supported browsers that weren't actually supported.