devpi-server-2.5.2: fix for 2.5.1 regression

[holger krekel]

We have a devpi-server-2.5.2 out which fixes a python2-related regression of 2.5.1.

best,
holger


2.5.2 (2015-11-20)
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- recognize "pex" for redirections of user/index/NAME to
  user/index/+simple/NAME just like we do with pip/setuptools.

- fix py2 incompatibility introduced with 2.5.1 where we used
  a unicode header and pyramid only likes str-headers.