Rename 'metadata' to 'properties'#345

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tseaver wants to merge 3 commits intogoogleapis:masterfrom

tseaver:314-rename_metadata_to_properties

Commits on Nov 5, 2014

Expanded / explicit coverage and assertions for '_helpers._MetadataMixin'.
tseaver
committed
Remove redundant coverage for mixin methods.
tseaver
committed
Stop using 'metadata' to refer to all properties in bucket/key represetnation.
tseaver
committed