Started wrapping FFTW
 Some changes to FFTW wrappers
Refactored FFTW wrapper
Fixed some issues brought on by rebasing
Started work on FFTShift
Rebased off master
Refactoring FFTW wrapper
Implemented fftshift
Trialing FFTW with travis
Changes to travis for FFTW
Mistake in travis
Trying another fftw3 package
Trying a fftw3 package for single precision
Reverting fftw3 package selection
Fix for older fftw3
Another try for older fftw3
Changed propotype declarations
Another travis change
Change to extern declaration
Added testing for FFTShift