Update to recent libraries

* Updated to express 3.2.4
* Updated to use marked instead of node-markdown
* Updating for node v0.10.2+
* Updated travis to v0.10+
Updated package.json to support updated versions of express
Merge pull request #19 from rajsystems/update_marked

Update to recent libraries
Add "showDrafts" as an option to hide posts that are marked with a draft property.