Generate source maps on-the-fly

[peller]

Generating source maps dynamically would be a powerful feature. Google Closure can do this, not sure if it's worth the investment to bring support in Shrinksafe up to date also.

Not really useful here, but @jthomas filed a Dojo Toolkit request to generate static sourcemaps with the Dojo releases. Info on the sourcemap format is included there.

@billreed63 @JonFerraiolo @rbackhouse

[rbackhouse]

I have done some investigation and prototyping and the result is currently this isn't going to work in Zazl. I can get it to generate the source maps and place the sourceMappingURL comments in the returned JavaScript response but it appears that Chrome (the only browser that currently supports source maps) does not respect multiple modules and sourceMappingURL within the same javascript resource. It finds and handles the first module and then ignores the rest. I will followup on the Chrome dev newsgroup to see if this is going to be possible to support this