Commits

Wes McKinney authored dad1a8ee381
ARROW-832: [C++] Update to gtest 1.8.0, remove now unneeded test_main.cc I haven't tried this out on MSVC yet. Also includes .gitignore fix for ARROW-821 Author: Wes McKinney <wes.mckinney@twosigma.com> Closes #549 from wesm/ARROW-832 and squashes the following commits: 2f246a0 [Wes McKinney] Remove unused CMake variable 7a62cf4 [Wes McKinney] Small fix when ARROW_BUILD_BENCHMARKS=off 8eaa318 [Wes McKinney] Add dependency on gtest for benchmarks 5f692db [Wes McKinney] Update to gtest 1.8.0, remove now unneeded test_main.cc