Refactor Biscuit by centralizing build process on gulp.

* Provide base gulp tasks for easy use.
* Add base package.json with dependencies thus far.
* Add biscuit-utils dependendancy and use as a means from conveying a standard error format back to the biscuit http server in the event of an error.
* Add server-side error handling of build errors (simple).  TODO: Convert o GulpTaskError on the server and add a nice(r) template.
* Change http server to run gulp and report compile-time errors instead of embedding the build process within biscuit itself.