Added a few stub files for a mailer that gets triggered when a user publishes a question
rename user_mailer files to question_mailer, fleshed out emails with question content and links
Add handling of signed in user choosing recipient

Fixes #32
Add signature_threshold to person_detail

Closes #34
Add display of question signatures & threshold

#35
merge
added spec for question_mailer, nil check for person chamber attribute
merge