Uses 0.0.0.0 rather than 127.0.0.1
Updates to use Capybara.server_host

this is 127.0.0.1 by default, but can be overridden

http://rubydoc.info/github/jnicklas/capybara/master/Capybara.server_host
Merge pull request #3 from ctaintor/master

Update bound IP to be configurable via Capybara.server_host