Blender Git Loki

This fixes make release so that it does not package .svn dirs with the
build.
This is bug [#7387] Release files pack the .svn metadata directories

I took a breif look at the scons files and it looks like it has a fix
for them already. It would be great if someone that uses scons could
just do a quick double check and let me know if there are problems with it
and or just fix whatever slips through.

Kent