hem -d breaks spine.map dependency

[milesmatthias]

When I run hem server I get no errors.
When I run hem server -d, I see the following in the js console every page load:

GET http://localhost:9294/spine.map 404 (Not Found)

[cengebretson]

currently when running with -d switch, the javascript is left in non compressed format which leaves the sourceMappingURL=spine.map line in place from the spine.js file that is pulled in. So the browser ends up requesting a map file that isn't there. Without the -d switch it will minify everything and that sourceMappingUrl portion is removed.

Since hem combines everything into a single file, would have to come up with a way to merge all the source maps together to match single js file. Definitely doable but will take a bit of finagling to get it fully working. Maybe in the time being the sourceMappingUrl lines should just be removed from the single js file that is created...

[cengebretson]

closing this as a duplicate of #67