[core] Re-enable preliminary module loading (stubbed)

Add logic for parsing commandline options, and a preliminary stub for
loading modules.

Note: The idea is that core.module.load() will return a valid, but
empty, module that displays an error, if the module cannot be loaded

bumblebee-status

@@ -1,17 +1,20 @@
 #!/usr/bin/env python
 
 import sys
+import core.config
 import core.output
 
 def main():
+    config = core.config.Config(sys.argv[1:])
     output = core.output.i3()
     modules = []
-#    modules = core.module.modules()
+    for module in config.modules():
+        modules.append(core.module.load(module))
     sys.stdout.write(output.start())
     while True:
         sys.stdout.write(output.begin_status_line())
         for module in modules:
-#            module.update()
+            module.update()
             sys.stdout.write(output.draw(module))
         sys.stdout.write(output.end_status_line())
     sys.stdout.write(output.stop())