Add sass support. (check it out and test it)

[racedale]

Needed to change almost everything...

• SystemJS was replaced with Webpack,
• folder structure was changed from /app & /built to /src & /dist (mostly to prevent overlap during the transition, and it seems to be common)
• npm scripts updated
• package.json dependencies all changed (you'll need to clean and reinstall prod and dev dependencies)
• The actual app itself was manually updated from master as of 17b3856
• There is one global scss that doesn't get Angular2's weird View Encapsulation effect on it, and the rest are contained within the scope of the components the normal way.

If things look good let me know so I can manually merge it (since there will be a lot of merge conflicts)

[P0rzingod06]

Really good job dood. Pulled it down and worked like a charm for me.