Tweaks to improve the build speed of the JS.

[theduckylittle]

Trying to make fire.

[klassenjs]

grunt build hangs on Win7 in webpack:build-dev at 61% 390/456 build modules.

0% CPU usage, no disk, usage, plenty of free memory. This seems to match what was reported at amireh/happypack#70.

Where exactly it stops seems non-deterministic. I have a slight feeling of deja-vu with this and a node.js synchronization bug, but I can't remember what/where it was.

[theduckylittle]

As we're basically ignoring the source maps for "index" right now, maybe we just drop building that. It saves quite a bit of time on the build-deploy. That alone might make the process less onerous.

[klassenjs]

I am curious how much time and RAM that would save.

It would be cool if the source maps worked in production for debugging, but I have never figured them out (maybe a Firefox thing). So what I am trying to say is right now I wouldn't notice their absence.

[klassenjs]

Note: It looks like UglifyJS uses the source map in deploy to give line numbers in errors/warnings.

[theduckylittle]

closing for further research elsewhere.