Add winston logging transport#1830

Merged

stephenplusplus merged 15 commits intogoogleapis:masterfrom

ofrobots:logging-winston

Feb 8, 2017

Commits on Feb 8, 2017

logging-winston: initial import

ofrobots
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stephenplusplus
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logging-winston: add system tests

ofrobots
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code style
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resort options
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review changes
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make sure metadata is object before looping over it
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add transport to Winston
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add constructor test
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improve examples

ofrobots
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stephenplusplus
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validate options.level{s} and add some tests

ofrobots
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test refactor
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include missing packages & fix system tests
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add loggingwinston to docs config
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update deps
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change package name in docs config
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