make login optional, support passing config dict

setup.py

@@ -3,9 +3,16 @@
 # encoding: utf-8
 from distutils.core import setup
 
+def get_bzr_version():
+    import os
+    rev = int(os.popen('bzr revno').read())
+    if rev:
+        return u'%s' % rev
+    return u'unknown'
+
 setup(
     name="pandora_client",
-    version="1.0",
+    version="1.0.%s" % get_bzr_version() ,
     description='''pandora_client - headless archive client for pan.do/ra
 
 can be used instead of OxFF to keep archive and pan.do/ra instance in sync.