Metadata Editor Alpha
Added metadata editor to document show view. Users can add and edit rows
 of metadata in the document by double clicking a cell while in "edit"
 mode.

Data is sent to the controller for processing on save.

Added jquery plugin, table to json, to convert HTML table to json so it
 can be sent via ajax to the server.

Signed-off-by: shanesuofi <shanes@vandals.uidaho.edu>