Where is normal edit modifier? I want to have custom vertex normals. I have a brief search, and found the 
official doc. It claims that Normal Edit Modifier can do this, and it is placed in Modify column of all modifiers. However, in my blender program, the Modify column only has:


Mesh Cache
UV Project
UV Wrap
Vertex Weight Edit
Vertex Weight Mix
Vertex Weight Proximity


So where is the Normal Editor? Is it being deprecated? Or replaced by other stuffs?

I'm using Blender version 2.73.
The modifier you are looking for Normal Edit is under the modify column in the modifiers list, but only in version 2.74 and higher.
As the release notes show that feature was added in 2.74.

This picture is showing version 2.75