node fs read and write file fixes.

Options and callback parameters were often wrong.
Express3 fixes.
node fs.readFileSync fix

options parameter with encoding is required to get a string.
express3.d.ts had senseless code that broke under typescript v0.9.5.
Fix how-to-use comment for Typescript change.
Fix node setTimeout/setInterval so you can pass more arguments to them.

Also make typescript aware of the ref and unref methods on the objects
returned by setTimeout/setInterval.
Merge pull request #40 from AgentME/fixes

Fixes for node filesystem module and express3