Drop source map from generated files

[arschmitz]

On jQuery we decided to drop sourcemap support because browser support is so terrible discussion can be found here http://bugs.jquery.com/ticket/14415 might make since to do the same here.

[MichaelArestad]

Can we keep sourcemap support for dev builds (when running grunt watch)? It's super handy, but not super necessary if we componentize all the things.

[sfrisk]

We discussed in the meeting a few weeks ago (should have updated here along with the meeting notes). The plan was to keep it for dev builds, but remove it for prod.