Merge pull request #72 from apple1417/master #163

Job	Run time
build-ubuntu (clang-cross-oak-release, clang-cross)	3m 7s
build-ubuntu (llvm-mingw-willow-release, llvm-mingw)	1m 34s
build-ubuntu (llvm-mingw-oak-release, llvm-mingw)	1m 34s
build-ubuntu (clang-cross-willow-release, clang-cross)	3m 23s
build-ubuntu (mingw-willow-release, mingw)	2m 1s
build-windows (clang-willow-release)	2m 58s
clang-tidy (clang-willow-release)	11m 23s
spelling	4s
build-windows (msvc-oak-release)	1m 35s
clang-format	1m 52s
clang-tidy (clang-oak-release)	11m 25s
build-windows (clang-oak-release)	3m 29s
build-ubuntu (mingw-oak-release, mingw)	1m 57s
build-windows (msvc-willow-release)	1m 33s
	47m 55s

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