Adding Cmake support

• Support for CMake merged in
• added unit tests for FFT based convolution (only enabled if library is linked against boost libraries)
• tested on Linux, MacOSX 10.10 and Win7 64bit

Release including binaries for Windows

The library is compiled with MSVC2013 and CUDA 6.5, so you might need to install the appropriate libraries and runtime to execute the libraries. Thanks Fernando Amat for compiling!