Buildbot tweaks

Add numpy installation to blender player configuration,
this is so because player is building first and it installs
python, which prevented numpy installation from blender
configuration.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56243 954f8c5b-7b00-dc11-b283-0030488c597c