Issue 85 Add warning that AX_FOCUS_02 is not available from axs.Audit.run()

As discussed here: https://github.com/GoogleChrome/accessibility-developer-tools/issues/85

Notes:
1) When running grunt I kept getting an error that "goog" was not defined.  It seemed to be because grunt could not find ./lib/closure-library/closure/goog/base.js.  I had 
2) Perhaps related to #1, but I have no idea why my version of the generated file has so many lines that are only off by a ; character.
3) There is one warning