Update README.md
Update README.md
Replace dummy urls _unused_dummy_... with empty strings
FIX: changes needed to fix permission denied exception on Firefox >= 30

 - https://github.com/emberjs/ember-inspector/issues/147
 - https://blog.mozilla.org/addons/2014/04/10/changes-to-unsafewindow-for-the-add-on-sdk/
Merge pull request #149 from rpl/fix/permission-denied-exception-on-firefox-30

FIX: changes needed to fix permission denied exception on Firefox >= 30
Stringified json should not get extra quotes when edited in the object inspector

Fixes #150
Use SVG badge in README
Merge pull request #151 from seanlinsley/patch-1

Use SVG badge in README
FEATURE: New "Render Performance" menu item to profile rendering speeds
and help diagnose issues.
Send added node profiles instead of the entire render tree
Update render to tree to look and feel like the other tabs

- Updated render tree UI
- Added render tree tests
- Upgraded Ember
- Fixed failing promise tests from ember upgrade
Update render performance nav icon