Added FftwTransform, a class which satisfies the Transform interface needed by Waveform. A far-from-complete test program and makefile were also added for FftwTransform. The FftwTransform class will be fleshed out more, offering an interface to more of fftw's transforms (r2r, dst and dct, and perhaps multi-dimensional once Waveform is capable) and also STL complient iterators and allocators wrapping fftw3 features.