make user#events and user#teams only return unique results and add has_many *_leads associations with events and teams through leadership_roles.
add methods to return all events and teams for a user through jobs and leadership roles.
Merge pull request #11 from epicodus/user_events_and_jobs_through_leadership_roles

User events and jobs through leadership roles
remove Task.incomplete and Task.complete methods and fix the job#comleted_tasks and job#incompleted_tasks
fixed test that conflicted with new factories
last layout changes