[BEAM-1375] Trigger builds on Github push notifications.#1893

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jasonkuster wants to merge 2 commits intoapache:masterfrom

jasonkuster:scm-trigger

Commits on Feb 1, 2017

Switch to trigger builds on push notifications from GitHub instead of polling SCM every minute.
jasonkuster
committed

Commits on Feb 2, 2017

Address PR comments.
jasonkuster
committed