Make some effort to comply with style guide#1379

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tomwhoiscontrary wants to merge 2 commits intojunit-team:mainfrom

tomwhoiscontrary:comply-with-style-guide

Commits on Oct 30, 2016

Add Checkstyle to report on and enforce conformance to the Google style guide (#1350)
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Add the Google Formatter plugin, as a discretionary step (#1350)
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