Add coveralls badge and cleanup tests

Author: daspecster

README.md

@@ -2,4 +2,4 @@
 Official python library for GetZiptastic.com
 
 [![Documentation Status](https://readthedocs.org/projects/ziptastic-python/badge/?version=latest)](http://ziptastic-python.readthedocs.org/en/latest/?badge=latest)
-
+[![Coverage Status](https://coveralls.io/repos/Ziptastic/ziptastic-python/badge.svg?branch=master&service=github)](https://coveralls.io/github/Ziptastic/ziptastic-python?branch=master)

ziptastic/tests.py

@@ -60,7 +60,3 @@ def test_build_url(self):
     def test_object_is_returned(self):
         result = Ziptastic.get_from_postal_code('48867')
         self.assertTrue(type(result), 'object')
-
-
-if __name__ == '__main__':
-    unittest.main()