* Added autocomplete support for local knife file uploads
* Added option to allow for relative path resolution for cookbooks
* Updated _chef_root function to use directory:h
This commit adds the --format tag to all of the autocompletion functions. The default format changed from json to a "human readable" format as of version 0.10. This change should be backward compatible. Alternatively, these commands could be simplified by using the new default human readable format.