Add in support for vxl.
Add LLVM 3.4 package
Merge pull request #195 from hashdist/llvm

Add LLVM 3.4 package
FFTW: build single precision as well
Add nanomsg.
Add flask + dependencies.
Merge pull request #198 from lanewittgen/master

flask and nanomsg
Merge pull request #196 from hashdist/fftw

FFTW: build single precision as well
Add in a test to verify that vxl builds correctly.
Merge pull request #156 from robertmaynard/vxl_pkg

Add in support for vxl.