Use 0.6.1 version number everywhere.

dulwich/__init__.py

@@ -27,4 +27,4 @@ import protocol
 import repo
 import server
 
-__version__ = (0, 6, 0)
+__version__ = (0, 6, 1)

setup.py

@@ -8,7 +8,7 @@ except ImportError:
     from distutils.core import setup, Extension
 from distutils.core import Distribution
 
-dulwich_version_string = '0.6.0'
+dulwich_version_string = '0.6.1'
 
 include_dirs = []
 # Windows MSVC support