- Added simple benchmark script.
- Added vimproc#cmd#system() experimentally.
- Improved for cwd.
- Added tests for vimproc#cmd#system().
- Fixed vimproc#cmd#system().
- Improved vimproc#cmd#system().
- Fixed error.
- Fixed cmd#system().
- Improved a bit.
- Improved a bit.
- Fixed cd in vimproc#cmd#system().