[AIRFLOW-984] enable subclassing of SubDagOperator#2152

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patrickmckenna wants to merge 3 commits intoapache:masterfrom

patrickmckenna:recognize-subdag-subclasses

Commits on Mar 14, 2017

[AIRFLOW-984] enable subclassing of SubDagOperator
patrickmckenna
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Commits on Mar 15, 2017

remove deprecated import
patrickmckenna
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Commits on Mar 16, 2017

acknowledge the past, embrace the future
patrickmckenna
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