DevApp

You can see a preview on gh-pages http://demos74dx.github.io/DevApp/
It will look slightly different due to fluid widths, the app runs at 1200x600px.
This project uses Chrome Apps, here's how to make it work:

1. Clone it
2. Open chrome
3. Goto chrome://flags/
4. Enable Experimental Extension APIs (This add an apps bookmark to chrome)
5. Restart chrome
6. Tools->Extensions
7. Click the Developer Mode Checkbox
8. Click Load Unpacked Extension button
9. Navigate to the DevApp folder and select it
10. It should now be installed under your Program Files->Chrome Apps
11. or you can open a new tab and hit the new apps bookmark and pull it up from there.

From here you don't need to keep Loading the unpacked extension, changes are made immediately.