first draft of fft block
added fft block to library
importing from new go-imap location
Merge branch 'master' of https://github.com/nytlabs/streamtools
Merge pull request #420 from jprobinson/master

importing from new go-imap location
Merge pull request #322 from nytlabs/fftBlock

FFT block
FFT fix for the route change
adding FFT to linux/arm...
Merge pull request #424 from nikhan/fft_fix

FFT fix for the route change (merge asap, broken build)