Adding custom nodesize and textsize properties to dendrogram construction config object.
Attempt at adaptive hide/show criterion for text labels.
Merge branch 'dendrogram-options'
WIP: horizontal/vertical tree option
Implemented vertical mode.
Including user function for enter/update/exit manipulation on update.
Replaced click with dblclick in tree expand/collapse.
Abstracting styling out of inner mechanics of dendrogram.
Added a CSS "hook" for detecting whether a node is collapsed or not.
Fixed missing semicolon.
Setting width and height the right way to account for vertical mode.
Flip tree horizontally about its midline in vertical mode.
Adding option for line type.
Simplifying abstracted line function (no longer needs to be passed "this" argument).
Removing automatic "range" labeling for collapsed nodes.
Added node color options.
Renamed "initialize" to "newNodes"; eliminated access to update and exit selections.
Abstracting "collapse" function into an "actions" table; limiting collapse action to ctrl-click.
Added "on" method that calls the callback in the right way, etc.; removed automatic setting of "collapse" function to clicking.
Adding custom nodesize and textsize properties to dendrogram construction config object.