Added new doc for running test in chrome
Env var support, documented xdebug usage
Update README.md

Fix regex difference
Merge pull request #18 from madmatt/patch-1

Update README.md
Merge branch 'doc' of https://github.com/srizzling/silverstripe-behat-extension into srizzling-doc

Conflicts:
	README.md
Overwritten clickLink to traverse page for hiddenFields