Fix Mingw-w64 build

Fix compilation of googletest with MinGW using Win32 threads

Fixed issue #775. Mark the ConvertibleFromAny constructor as explicit, and fix operator overload issue for Unprintable

Add Appveyor badge to Readme.md

Run MSVC tests on AppVeyor

Rollback change #808.

fix to operator precedence in GTEST_TEST_BOOLEAN_ with expressions th…

Fixed googletest dir issue for building googlemock.

Fix whitespace in paragraph

Read Bazel's $XML_OUTPUT_FILE environment variable

Fix typo (Inovke -> Invoke)

Fixed typo ('XCode' -> 'Xcode')

If $XML_OUTPUT_FILE is set, and $GTEST_OUTPUT and --gtest_output are not
specified, produce output as if GTEST_OUTPUT=xml:$XML_OUTPUT_FILE had
been set.

It's not supported, and native Windows threading is available for MinGW

Fix formatting in AdvancedGuide.md

Put occurrences of "#include" in a code span so they are not interpreted
as headers.

Other documents were not broken because the #include was not at the
start of the line, but put them in code spans anyway just in case the
text gets refilled in the future.

Change error message of EXPECT_EQ to treat lhs and rhs equivalently.

Fix link that's returned when running tests. #714

Add build artifacts to git ignore.