Chose User Team
signed up for team
Added myself to Event team
Update DESIGN_PLANNING.md

added Iteration 2 for Implementation Plan
Fixed teams and Peter's iteration 1/2 typo
Added changelog section for submission
Merge branch 'develop'
added promoted member to admin user story
added sub-tasks for promote-user-admin user story
Removed future iteration stories already covered
Merge branch 'develop'