Merge pull request #12 from jennjwu/dev_jenn

add home, login, and signup pages (html only, php form handler not done)
Merge pull request #13 from jennjwu/dev_jenn

update schema for db, add 1 more venue, add 1 more user
Merge pull request #14 from jennjwu/dev_jenn

fix schema discrepancy in createdb.sql