Less verbose

Took a stab at this... it won't suppress driver output (ie selenium chrome driver, etc), since that doesn't much sense to me, you should always see the test results. Other than that it just hides all of Selenium's garbage output.

`rake protractor:spec nolog=y # all quiet`

`rake protractor:spec nolog_selenium=y # no selenium (just drivers)`

`rake protractor:spec nolog_rails=y # no rails`

Resolves #8