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
Merge branch 'master' into sparkline-inline

Conflicts:
	lib/tricle/presenters/metric.rb
	tricle.gemspec
Merge remote-tracking branch 'origin/master' into sparkline

Conflicts:
	lib/tricle/presenters/metric.rb
	tricle.gemspec
Merge branch 'sparkline' into sparkline-inline

Conflicts:
	lib/tricle/aggregation.rb
	tricle.gemspec
move sparkline dependencies to gemspec
Merge branch 'sparkline' into sparkline-inline
re-generate appriasals
Merge pull request #60 from afeld/sparkline-inline

attach sparkline images inline
Merge remote-tracking branch 'origin/master' into sparkline
use sparkle for rendering sparklines
include the extension in the sparkline url
include alt text for the sparkline
remove irrelevant link