New: include mei.js events system in west.js HTML
Update mei.js revision
New: integrate mei.Events system

Uses the events system with the existing menu actions to dispatch events to WebWorkers using createWebWorker().
New: clear boxes functionality

Allows the user to clear the HTML from all inner boxes.

Known issue: This does not kill the WebWorker processes corresponding to each box.
Formatting: JSHint/global declaration

Without first declaring curKeyIndex, we are creating a global variable.