Better enforce is_valid as a flag that indicated proper configuration has been completed, added comments and warning
Fix joint variable location segfault
Merge branch 'constraint_samplers_improvement' into pull_requests_compile_test
Merge branch 'hydro-devel' into kinematic_base
Merge branch 'hydro-devel' into pull_requests_compile_test
Merge pull request #151 from davetcoleman/constraint_samplers_improvement

Constraint samplers bug fix and improvements
Merge branch 'kinematic_base' into pull_requests_compile_test
Merge branch 'robot_model_state_multi_tips' into pull_requests_compile_test
Merge branch 'hydro-devel' of https://github.com/ros-planning/moveit_core into hydro-devel
Merge branch 'hydro-devel' into kinematic_base_non_chains