added user stories to spec
Update SPECIFICATION.md
added join club user story
Fixed table typos; added iter2 stories

- Fixed table alignments
- Added User Profile and User Dashboard stories
- Moved tutorial to future iterations
- Removed Profile/Dashboard from future iterations
Bump SPECIFICATION.md revision

Bump revision from 1.1 to 2.0
Reformat DESIGN_PLANNING.md

Reformat Design Details section in DESIGN_PLANNING.md
Added to User Stories for Future Iterations
Added ITER2 stories to implementation plan
Bump DESIGN_PLANNING.md revision and date
Bump SPECIFICATION.md date
signed up for iter 2 team