Fix jsontool reference in README.md Reviewed by: Patrick Mooney <patrick.mooney@joyent.com>
Fix jsontool reference in README.md
Reviewed by: Patrick Mooney <patrick.mooney@joyent.com>

dan-luk/node-smartdc,andyYatskov/node-smartdc,arekinath/node-smartdc,13W/node-smartdc,joyent/node-smartdc