BeagleEnvironment updated. Test added.
beaglecontext.py updated.
beagleorder.py updated.
Updated beaglecomposite.py. Added matrix realignment function to `beaglecontext` to deal with differences between stopped and unstopped corpora.
Revised `vsm.model.Model` and renamed to `BaseModel`. Now contains just IO for single-matrix models.
lsa.py updated.