Support $VCSH_GITIGNORE == none

This will neither add core.excludesfile nor write a ignore file.
vcsh: Fix stupid syntax error

Thanks to Alessandro Ghedini.
vcsh: do not create .gitignore.d if VCSH_GITIGNORE == none
Fix commit 96f74d26de89fa1e390e26d015208163f689629e

Quote $1; change

	check_directory=$1

to

	check_directory="$1"
Merge branch 'gitignore-none'
Merge branch 'master' of github.com:RichiH/vcsh