src/externals is now part of the repo again

So we don't need to make it.
Merge remote-tracking branch 'upstream/master' into saucelabs
Fix broken test in IE7 - case sensitivity for tiddlyFields

The test was previously looking for tiddlyfields but the
ToggleTiddlerPrivacyPlugin under test looks for tiddlyFields.

The TiddlyWiki code uses tiddlyFields but there are other
plugins in this code base which use tiddlfields. I am
reluctant to change this until test coverage is better
understood.
Just show browser test matrix
Makefile shortcuts for saucelab and local browser testing
Notes on how to run QUnit tests via Sauce Labs