Switch the build system from Make to CMake

[kloudkl]

There have been a growing number of platforms that Caffe needs to be built against. Various flavors and versions of Linux, OSX, Windows, CPU only version and even HPC clusters complicate the situation. To make the build system more cross-platform, modular and manageable in the long run, we had better take a less hacky way. One of the most suitable options is CMake which is adopted by many mature open source projects including OpenCV and Intel TBB. There are also a number of examples that use it to build CUDA related projects.

[shelhamer]

Improvements to the build system are welcome!

We do not have particular expertise in CMake or autotools, but a configurable build with either would be helpful. It should support all the current targets.

[niuzhiheng]

I also think switch to CMake is a better solution. If so, it may be much easier to integrate my windows porting as well and to keep it up to date.

[akosiorek]

I've prepared a CMake build system for Caffe. I'd like to push a feature branch and then PR, but I have an 'acces denied to BVLC/caffe' error. It's my first public contriburion ever. Any hints?

Edit:
Resolved. I had to fork first and push the feature branch to my own fork.

[kloudkl]

Move to #442 for further discussions.