EventEmitter change with 0.16.0

[MCMicS]

With 0.15.0 it was possible to add eventListener with tab.once because it use the EventEmitter from events module.

This was removed in index.js with small abstraction and only tab.on is available.

Since PR #120

[MCMicS]

The typescript definition also reference to nodejs EventEmitter. So we should either use the nodejs EventEmitter or change the Type Definition