Added without_events method to ObserveEvents class. This feature upda…

[JarriqTheTechie]

Added with_events & without_events method to mute events.

Example usage.

user = User.without_events().create({"name": "Walter Emert", "email": "phill"})
user.with_events()
user.name = "Bobby Turner"
user.save()

In the above example we muted the events before creating the users then unmuted them before saving the mutated user.

[JarriqTheTechie]

@josephmancuso ready for review.