basic cola example
start with empty nodes and links
some tidy up
some tidy up
memoize requestData
memoize requestData fixed bug
basic enter exit
color nodes
aggregated weight for links
testing force options
basic paths for links
nicer paths
bigger
separated start node link and labels into separate functions
some clean up of stuff, removed code for strait limks
more sensible variable names
grouped svg elements
basic buttons
zoom implementation
Merge branch 'cola-aggregated-links-path'