Issue 6842: Closure inspection is broken in Fx27

https://code.google.com/p/fbug/issues/detail?id=6842
Fix FBTests after issue 6842
Closure scopes should not be inspectable
Merge branch 'master' into jsd2

Conflicts:
	extension/content/firebug/console/closureInspector.js
	extension/content/firebug/console/commandLine.js
	extension/content/firebug/debugger/debuggerLib.js
	extension/content/firebug/dom/domBasePanel.js
	extension/content/firebug/js/debugger.js
	extension/modules/firebug-service.js