Add randomSeed variable to SAC problem constructors.

Conflicts:
	include/opengv/sac_problems/absolute_pose/AbsolutePoseSacProblem.hpp
	include/opengv/sac_problems/point_cloud/PointCloudSacProblem.hpp
	include/opengv/sac_problems/relative_pose/CentralRelativePoseSacProblem.hpp
	include/opengv/sac_problems/relative_pose/EigensolverSacProblem.hpp
	include/opengv/sac_problems/relative_pose/MultiCentralRelativePoseSacProblem.hpp
	include/opengv/sac_problems/relative_pose/MultiNoncentralRelativePoseSacProblem.hpp
	include/opengv/sac_problems/relative_pose/NoncentralRelativePoseSacProblem.hpp
	include/opengv/sac_problems/relative_pose/RotationOnlySacProblem.hpp
	include/opengv/sac_problems/relative_pose/TranslationOnlySacProblem.hpp
Revert removing sac::
Merge branch 'master' into feature/add-seed-constructor

Conflicts:
	include/opengv/sac_problems/absolute_pose/AbsolutePoseSacProblem.hpp
	include/opengv/sac_problems/point_cloud/PointCloudSacProblem.hpp
	include/opengv/sac_problems/relative_pose/CentralRelativePoseSacProblem.hpp
	include/opengv/sac_problems/relative_pose/EigensolverSacProblem.hpp
	include/opengv/sac_problems/relative_pose/MultiCentralRelativePoseSacProblem.hpp
	include/opengv/sac_problems/relative_pose/MultiNoncentralRelativePoseSacProblem.hpp
	include/opengv/sac_problems/relative_pose/NoncentralRelativePoseSacProblem.hpp
	include/opengv/sac_problems/relative_pose/RotationOnlySacProblem.hpp
	include/opengv/sac_problems/relative_pose/TranslationOnlySacProblem.hpp
Merge pull request #7 from ethz-asl/feature/add-seed-constructor

Feature/Add non-random seed constructor to SAC problems