Added change_label to change metadata labels in existing corpus.
added corpussent option to change_label.
Added stemmer functions.
Cleaned up change_label method.
Merge branch 'change_label'
sim_* fns updated to dist_* fns
Merged similarity.py into vsm.viewer.__init__.py
Merge branch 'develop' into convert-to-dist-fns
Further refactoring of vsm.linalg with updates of viewer classes.
Added __init__.py to clustering extension
Refactoring
Extensive refactoring.
Examples.
Adding file neglected in previous commits.
Deleted old sphinx generated documentation.
Compatibility of angle_sparse with scipy.sparse version < .13
Merge branch 'general-refactoring' of github.com:inpho/vsm into general-refactoring
Updated documentation.
New map_corpus submodule and test data `Short History of Greek Philosophy`
Working on documentation.