Add add a classification type to the classifiers
Add a classification type to the API
Add classifier type to the tests
Add classifier type to the base class
Add a classifier type to sqlalchemywrapper
Add classification_type to all explain functions

As a result of these two branches moving in parallel the explain functions
did not receive a classification_type
Add a base class for certain types of tests

This is so training data can be reused across classes.
In fact nonsensefilter's test have been using this for quite some time
but this was not committed. Oops!
Add a classification_type ('spam') to report.py
Add a default test config for spicedham backends
Add default config to spicedham for tests
Remove code smells

Refactor to use setUp functions, base classes, etc.
Refactor tests to use a base class
Merge pull request #37 from iankronquist/multiple-classifications-20

Multiple classifications 20