New issue 168 by matt.goo...@gmail.com: Don't rely on pkg_resources for
version string
http://code.google.com/p/couchdb-python/issues/detail?id=168
If pkg_resources is not available the couchdb.__init__ modules sets the
version string to '?'. We shouldn't rely on pkg_resources for something so
important, especially as it's the only use of pkg_resources.