Add FFTW support
Create an FFTW module
Add a test for FFTW
Add test_fftw_c.c
Use actual benchmark sizes
Just keep the fast versions
Implement better alloc/dealloc of FFTW arrays
Refactor helper functions
Rename symbols
Simplify imports
Merge branch 'master' into fftw

Conflicts:
	src/CMakeLists.txt
Add test_travis.sh driver script
Travis: Use the driver script
Travis: use [[ instead of [
Travis: Simplify the tests definitions
Travis: Add a test for FFTW
Travis: install fftw3
Add missing definitions to fftw.f90
Merge pull request #29 from certik/fftw

Add FFTW support