added reverse and shift ops, throw error if op not supported.
added reverse and shift ops, throw error if op not supported.

npmcomponent/Wizcorp-node-tomes,bjornstar/tomes,ronkorving/node-tomes,bjornstar/tomes,ronkorving/node-tomes,npmcomponent/Wizcorp-node-tomes,Wizcorp/node-tomes,Wizcorp/node-tomes