Merge pull request #51 from hughrawlinson/dspjs

JSFFT + fixes
Create LICENSE
removed fft_image
fixed power spectrum
Merge pull request #52 from hughrawlinson/powSpec

fixed power spectrum
bufferSize error handling
bla
Buffersize error handling
implemented hanning window
small change
Merge pull request #54 from hughrawlinson/hanning

implemented hanning window
fixed merge conflicts
now 4real