display sparkline in mailer
style the sparkline
update screenshot with sparkline
move sparkline below other metrics
add space between metrics in mailer
update screenshot
upgrade mail_view
attach sparkline images inline

doesnt work in mailview
Add more sparkline display features from afeld's sparkline-inline branch
Report stats in chronological order, ensure 13 weeks are in a quarter
Use weekly aggregates for quarterly report
Allow uploading of sparklines to s3. Add randomization to sparkline image names to avoid incorrect image references for metrics with duplicate titles. Fix comments