Merge pull request #1 from atduskgreg/master

Add flask server skeleton
Merge pull request #2 from atduskgreg/master

basic interface for turning pieces on and off
Merge pull request #3 from atduskgreg/master

chess control visualization interface
boomerang_server correctly outputs JSON
draggable pieces
drop log call
Fix one-time drag issue
Integrate pieces object into drag-and-drop, display dragged move, integrate drag with hide/show
Re-highlight on piece drag
Slightly modified layout for displaying moves
Merge branch 'shannon'