Merge pull request #7 from skalawag/WEEK4

Week4
welcome email
email template in production
changed email address to wagflix
fix formatting in config
small edit
added letter_opener
got rid of needless comment
revised users controller email tests to use expect idiom
password confirmation routes
added token to users table
password reset
set up mailtrap for development
user can reset password
minor refactor
expired password token redirect
an error message
tests for incorrect email