add multiple plots, alert on incorrect format, modified binning algorithm
nav arrow toggling
remove dead plots from canvas

kind of hacky.  adds 'dead' class to plots scheduled (?) for execution,
filtering them from plotting
plot titles and bounding box
rounded bars
default plot labels
x tick marks and plot title
tick algorithm

optimal tick density set to ~5 ticks, half ticks or quarter ticks
appear if necessary
commented tick code
fixed last rect being too bold
added sortability
Merge pull request #4 from jackdreilly/gh-pages

added sortability
correct collapsing issue to go with sorting

plot objects now <li>
fixed input selection, tweaked interim tick mark glyphs
added unicode half and quarter ticks, changed back to sharp rects
merged master to gh-pages
added period to readme