Fix fineness control
Ignore compiled js files
Remove arrows in -x and -y direction
Move drawGraphEquation into xkcd_plot.dart

Only one equation supported now
Can't indicate invalidity of equations
Support multiple equations
Correct indentation in controller
Add class Equation
Remove any equation at will
Graphs have proper ranges in the vertical direction. (ylim has proper value)

ylim is calculated with every graph in mind, in the drawGraphEquation function,
rather than being calaculated every time plot is called.
Remove no longer used function extent from lib/util.dart
Not passing xlim to drawGraphEquation

xmin and xmax are already passed to drawGraphEquation
Use xkcd-font from github.com/ipython/xkcd-font
Put credits in README.md
Fix a typo. (ploter should be plotter)
Put the graph on the upper part of the page

Draw sin(x) by default, so that the page doesn't look strange with a blank part
Default values for xlabel, ylabel, and title should be in the controller

Besides title isn't handled in xkcd_plot.dart