[core] Refactor engine

This is going to be a bit more comprehensive than anticipated. In order
to cleanly refactor the core and the engine, basically start from
scratch with the implementation.

Goals:

* Test coverage
* Maintain backwards compatibility with module interface as much as
  possible (but still make modules easier to code)
* Simplicity

see #23

tests/test_config.py

@@ -1,10 +1,18 @@
 import unittest
 
-import bumblebee.config
+from bumblebee.config import Config
 
-class TestConfigCreation(unittest.TestCase):
+class TestConfig(unittest.TestCase):
     def setUp(self):
-        pass
+        self.defaultConfig = Config()
+        self.someSimpleModules = [ "foo", "bar", "baz" ]
 
+    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(), 
+            map(lambda x: { "name": x, "module": x }, self.someSimpleModules))
 
 # vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4