Added ability to copy/deepcopy events#81

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emshotton wants to merge 5 commits intovishnubob:masterfrom

b0rkestra:master

Commits on Jan 6, 2016

added ability to copy/deepcopy events by replacing property() getter/setters with @property decorator and removed __slots__ on some event classes, fixes #60, #40
Matthew Shotton
committed

Commits on Jan 7, 2016

fixed passing text into instantiation of anything subclassed from MetaEventWithText
Matthew Shotton
committed

Commits on Jan 12, 2016

made events hashable so they can be used as dictionary keys
Matthew Shotton
committed

Commits on Feb 19, 2016

fixed bpm setter
Matthew Shotton
committed
fixed setter/property swap in a bunch of places
Matthew Shotton
committed