Refactoring get experiment ID into interaction so it can be used in world as well.
Merge branch 'mock-objects-samplepp-bigfix' of github.com:mbforbes/pr2_pbd into mock-objects
fix import and we may be good to go.
Merge branch 'mock-objects-samplepp-bigfix' of github.com:mbforbes/pr2_pbd into mock-objects