Add a bin to the package json

 * Changes the package name: mediawiki-parsoid > parsoid

 * Removes the main entry point to the module since what's listed
   doesn't exist and we aren't prepared to require("parsoid")

 * Adds a bin, parse.js, that can be installed globally with npm link.

 * Should we consider npm publishing?

Change-Id: I64af0768f56e807ec438cedc6a4c9d977b71e8af
Merge "Add a bin to the package json"