Fix links in daily e-mail

E-mails are rendered with the link to the issue pointing at
`issue_assignments/<number>/users/<number>/click` instead of the
complete URL.
Merge pull request #257 from leafac/fix-daily-mail-link

Fix links in daily e-mail
use assignment's repo
fix send_triage emails
fix send single email
fix the fixtures

We want to use implicit associations instead of hardcoded ids
Merge pull request #259 from codetriage/schneems/fuuuuuu-fixtures

fix the fixtures
handle false
rev git_hub_bub
fix find_each syntax
handle assignments that are blank
Bump rails to 4.1.2RC1
Replace :full_name with *full_name
Comment out page_entries_into

Reference - https://github.com/mislav/will_paginate/issues/382