[core/config] Add module aliases

Allow the user to provide aliases when loading a module multiple times
so that the modules can be differentiated (e.g. for passing parameters
to a module).

see #23

tests/test_config.py

@@ -6,13 +6,23 @@ class TestConfig(unittest.TestCase):
     def setUp(self):
         self.defaultConfig = Config()
         self.someSimpleModules = [ "foo", "bar", "baz" ]
+        self.someAliasModules = [ "foo:a", "bar:b", "baz:c" ]
+
 
     def test_no_modules_by_default(self):
         self.assertEquals(self.defaultConfig.modules(), [])
 
     def test_load_simple_modules(self):
         cfg = Config([ "-m" ] + self.someSimpleModules)
-        self.assertEquals(cfg.modules(), 
-            list(map(lambda x: { "name": x, "module": x }, self.someSimpleModules)))
+        self.assertEquals(cfg.modules(), list(map(lambda x: {
+            "name": x, "module": x
+        }, self.someSimpleModules)))
+
+    def test_load_alias_modules(self):
+        cfg = Config([ "-m" ] + self.someAliasModules)
+        self.assertEquals(cfg.modules(), list(map(lambda x: {
+            "module": x.split(":")[0],
+            "name": x.split(":")[1]
+        }, self.someAliasModules)))
 
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