Merge pull request #8 from therewasaguy/master

Checkbox Step Sequencer example
small doc changes
step sequencer example

thanks @therewasaguy
a few more comments in the source.

removed unnecessary transport looping.
Tone.Sources can sync to the Transport
new docs
updated looping API

removed “loop” method
new docs
no echo cancellation on microphone
started envelope follower (doesn't work yet)
added notes to frequency and updated connect method
>= sample instead of >
cleaner looking alias
at least instead of greaterThan now()
recursive connect if the input is also a ToneNode
EqualsZero ToneNode
Threshold ToneNode
EqualsZero tests
dispose methods
license in JSDocs