REL: generate both 2.5 and 2.6 win and mac os x installers in release script.
REL: generate both 2.5 and 2.6 win and mac os x installers in release script.

git-svn-id: 77a43f9646713b91fea7788fad5dfbf67e151ece@7810 94b884b6-d6fd-0310-90d3-974f1d3f35e1

jasonmccampbell/numpy-refactor-sprint,jasonmccampbell/numpy-refactor-sprint,Ademan/NumPy-GSoC,jasonmccampbell/numpy-refactor-sprint,teoliphant/numpy-refactor,Ademan/NumPy-GSoC,teoliphant/numpy-refactor,teoliphant/numpy-refactor,teoliphant/numpy-refactor,Ademan/NumPy-GSoC,Ademan/NumPy-GSoC,teoliphant/numpy-refactor,jasonmccampbell/numpy-refactor-sprint