Move event results tests into separate file
Calculate combined TT results by polling, not by complicated notification scheme
Remove Event#notification
Fix failing test
Remove unused CombinedTimeTrialResults methods
Fix combined TT results name. Propogated parent name was overiding default.
Fix longstanding bug in historical names. Current year and years after latest historical name should return current name, not last historical name
Only calculate combined TT results for TTs with results
Use SQL to find eligible TT results
Remove Event#notification
Merge branch 'combined-tt-results' of github.com:scottwillson/racing_on_rails

Conflicts:
	db/structure.sql
Expire cache after calculating combined TT results