Log Message:
Update to 1.4.23:

1.4.23
==================================================

- use newer apipkg version which makes attribute access on
  alias modules resolve to None rather than an ImportError.
  This helps with code that uses inspect.getframeinfo()
  on py34 which causes a complete walk on sys.modules
  thus triggering the alias module to resolve and blowing
  up with ImportError.  The negative side is that something
  like "py.test.X" will now result in None instead of \ 
"importerror: pytest"
  if pytest is not installed.  But you shouldn't import "py.test"
  anyway anymore.

- adapt one svn test to only check for any exception instead
  of specific ones because different svn versions cause different
  errors and we don't care.