pre-command and post-command will always be executed before and after
any command is being executed. This does not affect inner calls.

Use rm -r instead of rmdir as the directory will _never_ be empty

Add mr's vcsh lib to docs

* Make include more resilient (Thanks to Thomas Koch)
* Fix emphasis issues with underscores in variable names in MarkDown

Thanks to Brain May for pointing this out.

fixes #22

Thanks to Brian May for reporting this.

fix #22