Fix typo in variable name
Check for both rmagick and RMagick when deciding whether to use rmagick or not
Android set_icon uses rmagick if available instead of always using ChunkyPNG
Fix RMagic require

require 'rmagick' would work on mac due to lack of a case sensitive file system
but it should be 'RMagick'
Merge pull request #10 from tenforwardconsulting/zb-bugfix

Fix typo in variable name