Clear the gutter when being disabled
Merge pull request #3 from sabof/master

Remove the symbols when the minor mode is being disabled
don't proccess buffers without a file name
Merge pull request #4 from sabof/master

stop processing, when buffer doesn't have a file name
Bump up version and update Changes
Bump up version and Update Changes(Thanks sabof)
return 128 if default-directory does not exist

Invoking call-process-shell-command in a non-existing default-directory
will throw error.
Merge pull request #5 from doitian/quiet-non-existing-default-directory-error

return 128 if default-directory does not exist
Bump up version and Update Changes(Thanks doitian)
fix changes