Allow custom CXX_FLAGS
Merge branch 'master' into classifier

Conflicts:
	CMakeLists.txt
Use Yeppp library if available
Add benchmark for yeppp library
Add MITSUNARI Shigeo fmath library
Add AMD tests, switch to fmath by default
Fix typo
Add assignment cost to classifier benchmark
Dereferece symbolic link to fmath.hpp
Only use __builtin_assume_aligned in gcc 4.7+
Sketch tiled nich loop
Start unifying our rngs.
Compile lp models with pip.
Make the global_rng work from both py and cy.
Remove unused import.
Allow pip installs on osx.
Add readme to manifest to unbreak sdists.
Allow python to link libdistributions.
Install cython from ppa to speed up travis builds.
Quiet new pep8 errors.