Using \filemodCmp to check timestamps seems to work well. Merging.
update example doc
remove gmdoc; seems unstable :(
fix broken test for missing eps images
document bitmap options
document new \EndPreamble behaviour
use a preprocessor to switch = to # under windows

this should hopefully help out users a little more when they
add their own ps2pdf options
Fix the preprocessing command to convert = to # in windows.
Pull in changes from upstream.