Refactor cheesesteak.js EventEmitter emit function

Previous commit c950e85 came with a workaround to resolve a TypeError in
EventEmitter.prototype.emit for-loop. That workaround sacrificed some
readability for bug fixing due to technical debt.

bursey came up with a better solution on IRC which seems to work and
improves readability. Something needs to emit an event that wasn't bound
with "on", thus the event was not in the _events object.

Airbnb ES5 style guide requires to have all variables at top, so we
leave the len variable undefined at the top to be defined later. After
the _events check, we define len to avoid the TypeError issue while
conforming to Airbnb ES5 style guide and improving readability.

This commit also adds comments to document the function.

Suggested-by: bursey (#/g/partyvan @ Partyvan IRC)

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