issue-17: Added watcher to execute on main thread to support async change in mapper
issue-17: Initla concepts for SHFocus
issue-17: More advancements with SHFocus and SHDiscover
issue-17: Added initial wiring for label relationships in core data
issue-17: Fixed test issues with labels
issue-17: Updated SHNode.label to addLabel
issue-17: Removed archive property and made the core data object delete
Merge pull request #18 from StreamSH/issue-17

Issue 17