Use algorithmic style more

[padenot]

Related to #142

@beaufortfrancois had done some work, I cleaned it up. This is far from finished, we need a state machine, because we can't do things like:

1. If {{[[started]]}} is `true` and no <a event
     for=SpeechRecognition>error</a> or <a event for=SpeechRecognition>end</a> event
     have fired, throw an {{InvalidStateError}} and abort these steps.

instead we need to have a [[state]] (that could be "ended", "error", etc.) and check it.

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[beaufortfrancois]

LGTM

[evanbliu]

LGTM!

[padenot]

Fixed the validator thing, I'll merge now, thanks for the reviews!