[Ruby] ImageScience and BMP (bug + fix)

[steve]

Hey guys

I filed this bug and fix quite a while ago but it doesn't seem anything has
been done with it.  The problem is with processing BMP files with
ImageScience.

bug+fix:
http://rubyforge.org/tracker/index.php?func=detail&aid=15682&group_id=1513&atid=5921
another bug filing for it:
http://rubyforge.org/tracker/index.php?func=detail&aid=11586&group_id=1513&atid=5921

See any issues with it?  Any chance of getting this committed?

- steve