Bump version number to 0.6

CHANGES

@@ -0,0 +1,9 @@
+Attic Changelog
+===============
+
+Here you can see the full list of changes between each darc release.
+
+Version 0.6
+-----------
+
+First public release on July 9, 2013

attic/__init__.py

@@ -1,4 +1,4 @@
 # This is a python package
 
 __version__ = '0.6'
-__release__ = __version__ + 'dev'
+__release__ = __version__