[PATCH] Massive speeling correcton.

Sorry for all the traffic on this list today,

I went through trunk and found a large number of misspellings by using
a script. Only about half of the files I changed exist on ruby 1_8_7,
so I have attached a smaller diff for 1_8_7.

CAVEAT: I edited all comments without discrimination, not specifically
comments that are parsed by RDoc. If this is a problem I would be
perfectly willing to eliminate everything but the documentation
changes from my diff.

I would like to thank Evan Weaver for the (updated) raspell library!
Good Night