Added option to disable the highlighting of the last move.

A new option named data-wgo-mark-last-move is added to the
player. If is true the last move made is not highlighted
with a circle.
Added data-wgo-diagram to create read-only diagrams without controls
Renamed data-wgo-mark-last-move to data-wgo-marklastmove to match the naming style
Updated documentation
Added script to compress the JS files using the Google Closuer Compiler
Created new compressed files for lib and player
Merge pull request #13 from klangfarbe/master

New options implemented and added a script to build the compressed JS files