Bump wd dependency to 0.1.0, to support PhantomJS w/ newer selenium
Make browser selection more flexible

- change options.useChrome -> options.browserName
- add phantomjs task to Gruntfile
jshint complainin'
Auto-launch phantomjs if not in PATH
Delete unnecessary process checks, invert default to using npm phantomjs
switch to my fork of nodejs-selenium-launcher to get 2.35
version bump and readme changes