Removed catkin development directory files from repo. Fixed IFDEF guards for SkillExecutive headers. Added functions to parse TaskTrees from JSON strings instead of just files on disk.
Merge branch 'master' of https://github.com/hayesbh/Social-Hierarchical-Learning. Undeleted DefaultSkillExecutive.h

Conflicts:
	core_skill_execution_server/src/DefaultSkillExecutive.h