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Run autoconf from top-level directory.

Fix testing::Combine on MSVC 2017.

Pass MSVC's C4826 warning.

OSS Sync, cl 163329677

On platforms with std::tuple and not std::tr1::tuple, GTEST_HAS_COMBINE
gets turned off when it works fine (due to GTEST_TUPLE_NAMESPACE_).
Elsewhere in the project, several GTEST_HAS_TR1_TUPLE checks
additionally check GTEST_HAS_STD_TUPLE_, so use that formulation.

(The ones that don't are specific to std::tr1::tuple and are followed by
an identical GTEST_HAS_STD_TUPLE_ version underneath it.)

In particular, this fixes testing::Combine on MSVC 2017, which regressed
here:
https://github.com/google/googletest/pull/1348#issuecomment-353879010

Avoid warning C4619 in MSVC 2017.

C4800 has since been removed in MSVC 2017, so trying to silence it
throws warning C4619 when enabled.

When this build works, we know the autoconf support is working.

Re-enable MSVC++ C4389 warning in CmdHelperEq()

C4389 was inhibited in commit 4b83461e making behavior inconsistent with
other compilers.

CMake fixes for paths with spaces

remove GTEST_HAS_PARAM_TESTS

Also build when included in source.

Add top-level LICENSE and CONTRIBUTING.md files [skip ci]

Per the review comments.

Implement bazel-based builds in Travis.