Implement versioning for both Make and CMake

[lukeyeager]

Versioning added to the Make path in 18a3ff4.

We need it for the CMake path, too. Ideally, both build systems should read from the same file to get the version.

A stub for this has already been created for CMake (which may or may not be helpful):
https://github.com/NVIDIA/caffe/blob/rc2/cmake/Summary.cmake#L58-L86

[lukeyeager]

First attempt made at #6.

It's a hack, but it's a step in the right direction.

[lukeyeager]

This has been done for a while. The versioning code has also been upstreamed to BVLC with BVLC#3311.