//@ sourceURL changing to //# sourceURL

[paulirish]

it's changed in the spec to work around an IE bug:
https://groups.google.com/forum/m/?fromgroups#!topic/mozilla.dev.js-sourcemap/4uo7Z5nTfUY

In the meantime you can output sourceURL in both styles, but all devtools are picking up the latest version (with legacy support) and may phase out //@ in the future.

(The change was necessitated mostly for the sourcemap directive.)

[cramforce]

I'd even happier to add a second line if dev tools would stop displaying them in the source view. That would saving the changed files back work much better. I might have filed a bug for it, but maybe not :)