ZEPPELIN-1423 - Allow users to specify pre/post-execute hooks for interpreters#1470

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agoodm wants to merge 5 commits intoapache:masterfrom

agoodm:ZEPPELIN-1423v2

Commits on Sep 28, 2016

Added Interpreter Hooks to Interpreter Process
agoodm
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Commits on Sep 29, 2016

Commits on Oct 5, 2016

Ensure that registered hooks are applied after call to open()
agoodm
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Commits on Oct 6, 2016

Automatically detect default interpreter for registerHook()
agoodm
committed