WIP: chore(build): Added serve task

- configured watch task to automatically reload server and rebuild assets
- server/index.js now exports the server object
- added bin/www to start the server directly (not sure how I feel about this)

@6a68 @pdehaan this still needs a few additions but is definitely ready for some feedback.

### TODO

- [x] Update README

hapi->build, or build->hapi, or doesn't matter?
Does this mean that the server could potentially start up before the /dist/ assets have been fully created?