refactor mailer functions
refactored mention confirmation for " @handle " and refactor mailer specs
update README
add static homepage for all tweets
add seeds
refactor factories with sequencing, edit tests
add relationship for user follower and followed
add follower/followed associations and validations to relationships
add User model followed_user association
add following? and follow! methods
add followers and following numbers to show page
debug show page when no users are signed in and add link to create account