Changed config so we can do funky nuke specific builds to deal with the openexr version in nuke 5.1. 
Changed config so we can do funky nuke specific builds to deal with the openexr version
in nuke 5.1. 

code-google-com/cortex-vfx,ruschelp/cortex-vfx,code-google-com/cortex-vfx,code-google-com/cortex-vfx,ruschelp/cortex-vfx,ruschelp/cortex-vfx,code-google-com/cortex-vfx