created TagMailer mailer
Edited mailer model and views

*Added html and plain text email templates
*Created a email method to send these emails
working on tagmailer
working on tagmailer
fixed typo in mailer
does not have author in database ?
Merge remote-tracking branch 'upstream/master' into tag-emails
Merge remote-tracking branch 'upstream/master' into tag-emails
Merge remote-tracking branch 'upstream/master' into tag-emails
merging upstream
deleted _settings.html.erb
working on simple_form_for
Email updates are completely functional

TODO: Write tests, make functionality so that when an old book is updated with an old tag,
the user receives an email about it, but not a duplicate one about a previous tag.
updated email_update method
fixed merge conflicts
working with master, all tests passing
working now
Added related books back

Also updated tag mailer to work in any environment
Merge branch 'ernbrn-updated_email'