PROTON-596: Add config.bat environment settings for windows.
* Bug-for-bug compatible with config.sh 
** adds new paths after old paths
** uses fixed \build folder for builds
* For use with debug builds only (pending conversion to cmake configure .in file)
To use:
  > cd proton
  > call config.bat
  > cd build
  > ctest


git-svn-id: https://svn.apache.org/repos/asf/qpid/proton/trunk@1600727 13f79535-47bb-0310-9956-ffa450edef68