Merge master

[andreamlin]

Merge in updates from the master branch.

Implementation for something similar to #357 will come in a later PR. This is just a sync PR.

[andreamlin]

PTAL

[codecov-io]

Codecov Report

Merging #364 into gax-httpjson will decrease coverage by 1.89%.
The diff coverage is 18.01%.

@@ Coverage Diff @@## gax-httpjson #364 +/- ##
=================================================
- Coverage 67.73% 65.83% -1.9% - Complexity 535 542 +7 
=================================================
Files 135 151 +16 Lines 3065 3161 +96 Branches 215 215 =================================================
+ Hits 2076 2081 +5 - Misses 908 996 +88 - Partials 81 84 +3

Impacted Files	Coverage Δ	Complexity Δ
...java/com/google/api/gax/rpc/InternalException.java	0% <0%> (ø)	0 <0> (?)
.../google/api/gax/rpc/UnimplementedApiException.java	0% <0%> (ø)	0 <0> (?)
...google/api/gax/rpc/ResourceExhaustedException.java	0% <0%> (ø)	0 <0> (?)
...va/com/google/api/gax/rpc/OutOfRangeException.java	0% <0%> (ø)	0 <0> (?)
...java/com/google/api/gax/rpc/NotFoundException.java	0% <0%> (ø)	0 <0> (?)
...m/google/api/gax/rpc/InvalidArgumentException.java	0% <0%> (ø)	0 <0> (?)
.../google/api/gax/rpc/DeadlineExceededException.java	0% <0%> (ø)	0 <0> (?)
...com/google/api/gax/rpc/AlreadyExistsException.java	0% <0%> (ø)	0 <0> (?)
...m/google/api/gax/rpc/UnauthenticatedException.java	0% <0%> (ø)	0 <0> (?)
...ava/com/google/api/gax/rpc/CancelledException.java	0% <0%> (ø)	0 <0> (?)
... and 28 more

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[garrettjonesgoogle]

LGTM