fix last test, remove final warnings from test compilation
Merge pull request #211 from mikeferguson/fix_constraint_samplers

fix last test, remove final warnings from test compilation
fix spelling error in guard
Merge pull request #213 from mikeferguson/fix_guard

fix spelling error in guard
add collision_plugin.h
Merge pull request #214 from mikeferguson/collision_plugin

moveit_core components of collision plugins
update changelog
0.6.12