Stemmer gem

Stemmer gem.

The unreleased version of Bishop uses Ray Pereda's port to Ruby of Martin Porter's word stemming algorithm.

I've used this code before and I noticed Lucas uses the same code.
Despite it's size it made sense to us to package it as a RubyGem so
that others could make use of it without duplication. Thanks to a
suggestion by Lucas it's also going to be easy to plugin other stemmers later.

[Curiouser and curiouser!]

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