Shift Stats Email - Bugfixes

[caseywatts]

• [x] 1. All stats in the email currently return as 0.
• [x] 2. We wanted late/missed/leftearly shifts to have a link to the shift report, but Rails 2 couldn't for some reason. I think it just wasn't aware of the root URL we're on? (see #88 too). In the meantime we put the shift ID number, but really there should just be a link here to the shift's absolute URL.
• [x] 3. More Stats link is a relative link which never works - but Rails 3 should be able to do an absolute link like 2.

Recurring emails are sent by the whenever gem which creates cron jobs for rake tasks like this one UserMailer#email_stats?

• schedule.rb schedules the emails
• email_stats.rake gathers the data
• user_mailer.rb has the template

[caseywatts]

@derekzhao does this sound like what you need too?

[njlxyaoxinwei]

Addressed now in #449

[njlxyaoxinwei]

the start date and end date was passed in the wrong order, thus producing 0