Add commonjs support

[michaelBenin]

See: #36

[Maluen]

We're out of luck, ScriptPreprocessor has been deprecated:

• https://code.google.com/p/chromium/issues/detail?id=438626#c1
• https://developer.chrome.com/extensions/devtools_inspectedWindow#method-reload

[Maluen]

For the time being manual Backbone detection can be used: https://github.com/Maluen/Backbone-Debugger#backbone-detection