Test

Merge pull request #203 from mattn/shift-op #44

Job	Run time
test (installed, fast-test, vim-profile-installed.txt, python -m coverage run --append)	2m 49s
test (master, vim/test, vim-profile-master.txt, python3)	1m 17s
test (v7.4, vim/test, vim-profile-v7.4.txt)	59s
test (v8.0.0000, vim/test, vim-profile-v8.0.txt)	58s
	6m 3s

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