some housekeeping

- fix the crummy coffee-script/register issue that's causing travis to bork
- upgrade connect to 3.x (you might deem this premature, feel free to remove this)
- update dev dependencies (ref: https://david-dm.org/samccone/infestor#info=devDependencies&view=table)
- add MIT license (just a suggestion)
- add contributing.md (just a suggestion)
- some readme cleanups like using JS in example, flat badges, ect.