Updates for Python 3.4:

* Debug batch file searches for Python 3.4 now
* Updated shebang line
* Import hook is no longer required, 3.4 definitely works, not sure if 3.3 did
* Updated check for required versions, as well as links to latest versions of
  requirements
* An odd bug with the latest wxPhoenix snapshot needed some extra logic to
  ensure sys.stderr is writable before importing wx (a revision mismatch is in
  the latest snapshot build, and it tries to print a warning to stderr, but
  fails)