WIP: port to Firefox

[rpl]

I'm creating this PR to start discussing if it is an interesting change to be cleaned up and merged upstream.

"AngularJS Batarang ported to Firefox DevTools" WIP prototype:

• devtool panel and dom inspector sidebar prototypes
• run addon and build xpi from grunt tasks (grunt run_xpi, grunt build_xpi)
• introduce "firefoxExtension.js" to polyfill module "chromeExtension" module
• disable DOM Inspector addon sidebar when Batarang devtool panel is disabled
• cleanup changes
• test chrome addon built from grunt task (needed to preprocess panel.html on Firefox/Chrome builds)

[btford]

Woah this is crazy. Thanks @rpl!

[andreicristianpetcu]

I'm using this and it's great! Can you please submit it to Firefox addons list so we can install it with a click?

[andreicristianpetcu]

also, please rename the title to "AngularJS WebInspector Extension for Chrome and Firefox" :D

[ilanbiala]

@andreicristianpetcu I don't think it makes sense to have 1 repository for 2 separate extensions, the chrome and firefox extensions should probably have their own repositories in Angular, but that's just my thought.

[andreicristianpetcu]

Please add this adon to Firefox marketplace. I have been using it for quite a while in Firefox and I found no issues.

[SomeKittens]

Hey, this is fantastic! You should be able to tap into Angular Hint now for cross-browser instrumentation.

Closing this, as Batarang is Chrome-specific, but don't let that get you down!