[core] restructure to allow PIP packaging

OK - so I have to admit I *hate* the fact that PIP seems to require a
subdirectory named like the library.

But since the PIP package is something really nifty to have (thanks to
@tony again!!!), I updated the codebase to hopefully conform with what
PIP expects. Testruns so far look promising...

bumblebee_status/util/store.py

@@ -0,0 +1,44 @@
+"""Store interface
+
+Allows arbitrary classes to offer a simple get/set
+store interface by deriving from the Store class in
+this module
+"""
+
+
+class Store(object):
+    """Interface for storing and retrieving simple values"""
+
+    def __init__(self):
+        super(Store, self).__init__()
+        self._data = {}
+
+    def set(self, key, value):
+        """Sets key to value, overwriting any existing data for that key
+
+        :param key: the name of the parameter to set
+        :param value: the value to be set
+        """
+        self._data[key] = {"value": value, "used": False}
+
+    def unused_keys(self):
+        """Returns a list of unused keys
+
+        :return: a list of keys that are set, but never used
+        :rtype: list of strings
+        """
+        return [key for key, value in self._data.items() if value["used"] == False]
+
+    def get(self, key, default=None):
+        """Returns the current value for the specified key, or a default value,
+        if the key is not set
+
+        :param key: the name of the parameter to retrieve
+        :param default: the default value to return, defaults to None
+        """
+        if key in self._data:
+            self._data[key]["used"] = True
+        return self._data.get(key, {"value": default})["value"]
+
+
+# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4