b0ff255b55388de58925c2cd4974739c9592a036

This adds vertex snapping capabilities for curves. Snaps to all control points of other objects, and visible + selected control points and handles in curve edit mode. Reviewed By: brecht Differential Revision: http://developer.blender.org/D3
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OSX/cmake: rollback
ca5bbe0e41
cause OSX versions can have not subversion thus sw_vers -productVersion is not usable for sdk setting
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