Add unit tests to tox.

Author: jmchilton

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py27-lint,py26-lint
+envlist = py27-lint,py26-lint,py27-unit,py26-unit
 skipsdist = True
 
 [testenv:py27-lint]
@@ -12,3 +12,8 @@ commands = flake8 schema_salad
 whitelist_externals = flake8
 deps = flake8
 
+[testenv:py27-unit]
+commands = python setup.py test
+
+[testenv:py26-unit]
+commands = python setup.py test