Updating slides link.
Update HomeworkAssignments.md
Create sinatra_reading.md
add basic sinatra example
Merge branch 'master' of https://github.com/tibbon/WDI_Summer_Public
database walkthrough
updated address_book.rb
created psql cheatsheet
git cheatsheet
terminal cheatsheet
clarified basic addressbook file
clarified sql files
added postgresapp setup
sinatra db addressbook
finished basic sinatra
switched database to use id
delete cliffhanger
Quiz assessment
Merge branch 'master' of github.com:tibbon/WDI_Summer_Public
add edit functionality