html mails show a link to an updated attachment instead of just the name (issue #366)
test that the correct url including host and protocol is generated for attachments in an email. note the added :only_path option here, which defaults to true, which should mirror the original behavior.
update user mailer tests for html output
Merge pull request #107 from opf/feature/rails3-attachment-links

html mails show a link to an updated attachment instead of just the name