[modules/nic] Re-enable NIC module

Re-add the NIC module with all its functionality (hopefully...).

This introduces a new concept: Instead of having separate queries for
critical and warning (which really are just another set of states), a
module can now return a list of states for each widget. All the state
information is then merged together into a single theme. So, for
instance, the NIC module can return a state saying "critical -
wlan-down", which applies the theme information for both "critical" and
"wlan-down".

see #23

bumblebee/modules/cmus.py

@@ -80,3 +80,5 @@ class Module(bumblebee.engine.Module):
                 self._repeat = False if "false" in line else True
             if line.startswith("set shuffle "):
                 self._shuffle = False if "false" in line else True
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4