Made a css_html to obtain the html of the css element.

This works like css_click in that it will retry if there was a stale element reference exception
Refactored all clicks to use the css_click method
Merge branch 'master' into jonahstanley/fix-flakey-tests
Overzealous changing of find to click
Skipped Flakey Tests for now
Merge pull request #325 from edx/jonahstanley/fix-flakey-tests

Made a css_html to obtain the html of the css element.