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Comments changes, no functionality changes

Formatting changes for automatic code management

merging 

Internal CL 156157936, which was published in commit
fe402c27, introduced undefined behavior
by casting a base class (internal::{Naggy,Nice,Strict}Base<MockClass>,
using the curiously recurring template pattern) pointer to a derived
class ({Naggy,Nice,Strict}Mock<MockClass>), in the base class'
constructor. At that point, the object isn't guaranteed to have taken on
the shape of the derived class, and casting is undefined behavior.

The undefined behavior was caught by Chrome's CFI build bot [1], and
prevents rolling googletest past that commit / CL.

This commit simplifies the {Naggy,Nice,Strict}Mock class hierarchy in
a way that removes the undefined behavior.

[1] https://www.chromium.org/developers/testing/control-flow-integrity

RE-Doing the merge, this time with gcc on mac in the PR so I can catch errors before merging the PR

continued

Commit fe402c27 published the changes in
internal CL 156157936, but missed the diff in
gmock-generated-nice-strict.h.pump. This makes it difficult to reason
about the change, because the .pump file is more concise than the
generated file.

This PR was tested by re-generating the .h file using the command below
and checking the git diff.

./googletest/scripts/pump.py \
    googlemock/include/gmock/gmock-generated-nice-strict.h.pump

Picks up gtest r536; renames implicit_cast and down_cast to reduce the chance of clash (by Roman Perepelitsa); enables gmock_gen.py to handle storage specifiers (by Steve Fox).