Weakref callback#488

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BenLewis-Seequent wants to merge 10 commits intoRustPython:masterfrom

BenLewis-Seequent:weakref_callback

Commits on Feb 16, 2019

Commits on Feb 17, 2019

Add callback to object being reference.
skinnyBat
committed

Commits on Feb 18, 2019

Merge branch 'master' into weakref_callback
skinnyBat
committed

Commits on Feb 20, 2019

Move weak_refs attribute into Instance payload
skinnyBat
committed