Added CLI command for moving top-level nodes between projects.

Also introduces a slightly nicer way to get the database interface, and
an object-oriented way to allow dependency injection.

pillar/attrs_extra.py

@@ -0,0 +1,17 @@
+"""Extra functionality for attrs."""
+
+import logging
+
+import attr
+
+
+def log(name):
+    """Returns a logger attr.ib
+
+    :param name: name to pass to logging.getLogger()
+    :rtype: attr.ib
+    """
+    return attr.ib(default=logging.getLogger(name),
+                   repr=False,
+                   hash=False,
+                   cmp=False)