Revert "Add the --whitout web_driver option to the Travis CI bundler command"

This reverts commit 447145ae50b278f28204a35bd03025ac36d0bf40.
Revert "Add the web_driver gems to a seperate group in the Gemfile"

This reverts commit 43f587b127e2ca9ed3c5d09a260cfe6d13d43307.