New class for interacting with instruments
Add instruments.rb to the gem
Use the new instruments class in RunLoop::Core
Merge pull request #41 from calabash/feature/find-instruments-pids

Send 'QUIT' instead of `kill -9` or 'TERM' to halt instruments processes
Removes 'puts' from Core.run_with_options
Updates change log with 1.0.6 changes
Bump version to 1.0.6
Merge branch 'release-1.0.6'