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Improve doctoring for load_synthdefs
Move resolve_degree to Scale class and simplify implementation
move attr_reader declaration closer to initialize
resolve_degree is now found within the Scale class
Teach play and note to handle :r and :rest note names as nil
Fix tests now resolve_degree has moved
set default amp_slide val for basic mixer to 0.2
Teach runs to have a basic mixer:

* Paves way for overall amp of runs to be externally controllable
* Implement amp slide on stop, to remove clicks
* Default amp for run is 0.3
Add limiter to basic mixer:

* Also modify look ahead time to 0.01 (supercollider default)
Don’t print out .id of busses in ChanNode#to_s as may be numeric
Merge remote-tracking branch 'origin/master'
Ensure Cb is resolved an octave lower.

Thanks to Ambrose Bonnaire-Sergeant for pointing out this issue.