MAINT: Switch to the PyPI version of plex

This gives exactly the same output as before

numpy/linalg/lapack_lite/README

@@ -9,9 +9,9 @@ required by the ``LinearAlgebra`` module, and wrapped by the ``lapack_lite``
 module. The scripts in this directory can be used to create these files
 automatically from a directory of LAPACK source files.
 
-You'll need `Plex 1.1.4`_ installed to do the appropriate scrubbing.
+You'll need `plex 2.0.0dev`_, available from PyPI, installed to do the appropriate scrubbing.
 
-.. _Plex 1.1.4: http://www.cosc.canterbury.ac.nz/~greg/python/Plex/
+.. _plex 2.0.0dev: https://pypi.python.org/pypi/plex/
 
 The routines that ``lapack_litemodule.c`` wraps are listed in
 ``wrapped_routines``, along with a few exceptions that aren't picked up

numpy/linalg/lapack_lite/clapack_scrub.py

@@ -4,8 +4,8 @@
 import sys, os
 from io import StringIO
 import re
-from Plex import Scanner, Str, Lexicon, Opt, Bol, State, AnyChar, TEXT, IGNORE
-from Plex.Traditional import re as Re
+from plex import Scanner, Str, Lexicon, Opt, Bol, State, AnyChar, TEXT, IGNORE
+from plex.traditional import re as Re
 
 class MyScanner(Scanner):
     def __init__(self, info, name='<default>'):