Fix for missing DIRECTORY_SEPARATOR in message

* WINDOWS ENVIRONMENT VARIABLES *
For convenience, a REG file is available under C:\wamp\bin\php\php5.5.12PEAR_ENV.reg .
This file creates ENV variables for the current user.

Double-click this file to add it to the current user registry.
Merge pull request #31 from maximerassi/patch-1

Fix for missing DIRECTORY_SEPARATOR in message