Changed to use .quit() for ChromeDriver.
Added "Tag" on the end of the names of all the tags, to differentiate
them from the WebBrowser subtypes as well as the NoArgs in MixedFixtures.
Changed name of BrowserDriver to BrowserFactory, ChromeBrowser to ChromeFactory, etc.
Tweaked names of some of the tests to match the new "Factory" names.
Initial cut at MixedPlaySpec.
Renamed AllBrowsersPerTest to AllBrowsersPerSharedTest.
Deleted the temporary browesr tags, which are now in the 2.1.x branch of ScalaTest proper.
Bump ScalaTest version to 2.1.4-SNAP1.
Change tag names from *Tag to *Browser.
Drop email addresses from pom.