Arbow

# Adapted from here: https://gist.github.com/489093
# Original credit goes to pplante and copyright notice pasted below

# Copyright (c) 2010, Philip Plante of EndlessPaths.com
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is