simplify everything

remove all code not related to actual force graph, split/color/size by.

as a result removes a lot of the pre-processing, the entire subset
selection, and the concept of keeping track of filters
clicking on a node removes it
reset button properly applies splits/colors/sizes to new nodes
code cleanup
add basketball dataset
add nba dataset as demoset
split up stylesheets, move into dir
make custom coloring a param
basketball colors
fix params
order by
first steps towards selection box
remove nodes selected by box
change mouseout to mouseleave
added salaries and cleaned up basketball dataset
css to stop highlighting page and for reset nodes button
temporarily remove the nfl dataset

The NBA set is probably just as interesting, but the more manageable
number of nodes is probably better.  Plus the salary data is
interesting.
zooming!!!!
tooltip follows mouse

addresses bug where selecting a large circle and moving the mouse over
the tooltip fired a weird zoom event
reset colors and size