methods for mapping a module's object space to a DOT file

Prerequisites:
The ruby code doesn't have any prerequisites; however, to turn the dot files into pretty pictures you will need Graphviz (http://www.graphviz.org/).

Usage:
# write mod diagram to a dot file
def mymod_to_dot_file(mod, directional=false)
  File.open('mymod.dot', 'w+'){|f| f.write mod.to_diagram(directional) }
end

# write a directional diagram to a dot file and then process the file with dot to produce an SVG image
def dot_mymod(mod)
  mymod_to_dot_file(mod, true)
  `dot -Tsvg -o mymod.svg mymod.dot`
end

# write a non-directional diagram to a dot file and then process the file with neato to produce an SVG image
def neato_mymod(mod)
  mymod_to_dot_file(mod)
  `neato -Tsvg -o mymod.svg mymod.dot`
end