New target description + moving target stuff under "framework"

Changing the way target descriptions work from a static mapping to
something that is dynamically generated and is extensible via plugins.
Also moving core target implementation stuff under "framework".

wa/framework/target/config.py

@@ -0,0 +1,20 @@
+from copy import copy
+
+#Not going to be used for now.
+
+class TargetConfig(dict):
+    """
+    Represents a configuration for a target.
+
+    """
+    def __init__(self, config=None):
+        if isinstance(config, TargetConfig):
+            self.__dict__ = copy(config.__dict__)
+        elif hasattr(config, 'iteritems'):
+            for k, v in config.iteritems:
+                self.set(k, v)
+        elif config:
+            raise ValueError(config)
+
+    def set(self, name, value):
+        setattr(self, name, value)