cleanup of covariance update with sep
first gradient injection
best gradient injection + more functions
added support for gradient function to all algorithms + special fix for sep-CMA-ES with gradient
added protection against null gradient
Merge branch 'master' into gradient
Merge branch 'gradient' into minos

Conflicts:
	src/cmaes.h
	src/cmastrategy.h
	tests/test-functions.cc