rename Array#sum to #sum_with_identity to avaoid conflicts with activesupport etc
cannot monkey-patch GSL::Vector => call #sum_with_indentity only unless $GSL
fix for issue #4 - no prior used in Bayes classifier
whitespace fixes
using reduce on summing array
Adding test for Monkey Patch of Array
changed include? to has_key?

Conflicts:

	lib/classifier/lsi.rb
changed remove to delete in remove_item