Minor clean-ups of tests/test_loader.py.

tests/test_loader.py

 import unittest
-import pystache
 
-class TestLoader(unittest.TestCase):
-    
+from pystache.loader import Loader
+
+
+class LoaderTestCase(unittest.TestCase):
+
     def test_template_is_loaded(self):
-        loader = pystache.Loader()
+        loader = Loader()
         template = loader.load_template('simple', 'examples')
-        
+
         self.assertEqual(template, 'Hi {{thing}}!{{blank}}')
-        
+
     def test_using_list_of_paths(self):
-        loader = pystache.Loader()
+        loader = Loader()
         template = loader.load_template('simple', ['doesnt_exist', 'examples'])
-        
+
         self.assertEqual(template, 'Hi {{thing}}!{{blank}}')
-        
+
     def test_non_existent_template_fails(self):
-        loader = pystache.Loader()
-        
-        self.assertRaises(IOError, loader.load_template, 'simple', 'doesnt_exist')
\ No newline at end of file
+        loader = Loader()
+
+        self.assertRaises(IOError, loader.load_template, 'simple', 'doesnt_exist')