Fixing cmake scripts to make it compile

[Nerei]

This code patch fixes forgotten include_directories(${PROTOBUF_INCLUDE_DIR})

[Nerei]

Having much experience with OpenCV cmake scripts, I would do more development/refactoring of Caffe's scripts make them more featured, clever and smaller (in lines of code), but keep current behavior unchanged. But I don't know If authors of Caffe cmake are ok with such rework. I want also add CaffeConfig.cmake file generation so that users who use CMake can easily do find_package(Caffe).

[shelhamer]

Improvements to the CMake build are welcome. The core developers are
responsible for the Makefile build, but the CMake build is currently
developed by the community until it is full featured so please do improve
it.
On Wed, Dec 17, 2014 at 01:51 Anatoly Baksheev notifications@github.com
wrote:

Having much experience with OpenCV cmake scripts, I would do more
development/refactoring of Caffe's scripts make them more featured, clever
and smaller (in lines of code), but keep current behavior unchanged. But I
don't know If authors of Caffe cmake are ok with such rework. I want also
add CaffeConfig.cmake file generation so that users who use CMake can
easily do find_package(Caffe).

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#1586 (comment).

[Nerei]

Okay! Please please expect a big present after The New Year :-)