Connect vs Express compatibility issues, and Fiber wrap.

- `prerender-node` expects req.get() which just returns headers. 
- Wrap in fiber so it won't screw with current request headers.
Done away with Fiber and Meteor.startup(). Fixes #1
Added dependency: send
Added missing functions from express
Merge pull request #2 from electricjesus/master

Connect vs Express compatibility issues, and Fiber wrap. Fixes #1