add inviter's email to invitation email so that we can identify her later
add hidden field to email
added extra argument to invite_friend call
flash success for sent invitation
latest
removed inviter_email
removed inviter_email from mail
invitation token added to email
create a new invitation object with needed attributes
added token to email
validate attributes
delete session if it exists right before we create a new user
show action for invitation signup
delete an invitation for new user if invite exists