Added versioneer support

Author: fonnesbeck

.gitattributes

@@ -0,0 +1 @@
+pymc/_version.py export-subst

pymc/__init__.py

@@ -75,3 +75,6 @@ def __set_compiler_flags():
 from pymc.tuning import *
 from pymc.variational import *
 from pymc.vartypes import *
+
+from . import _version
+__version__ = _version.get_versions()['version']