Extensions don't support quoted strings

[Brickster]

If an extension contains a quoted string, the underlying command isn't executed correctly.

$ git config git-state.extensions.print-message "printmessage \"this is the message\""
$ git state -STBLR
# print-message

    message: this
$

Use shlex so that quotes strings are maintained:

import shlex
command = shlex.split('printmessage "this is the message"')