Renamed dm-voyeur to dm-observer
Did these renamings:
dm-voyeur -> dm_observer
Voyeur -> Observer
peep -> observe
neighborhood_watch -> observing
Did the renaming because:
* it makes this plugin easier to find
* the new name is more family friendly
Added some README docs.
DataMapper::Voyeur now takes Classes instead of symbols.
Renamed README.text to README.textile