created db & users table
set up user model in user.js & require auth-related dependencies in app.js
add views & routes for signup & login
sign up working
clean up code
login working with defaultLoc added
style/layout for signup & login
login/authorization working
fix signup to login error; increase cookie session for users
change nav based on user authentication
fix routing errors; add nav bar to 404 page
add clearfix class to tweets; fix duplicate streaming issue