Improve service traffic table on mobile

[spadgett]

Two issues:

• It's not clear where each row ends in the mobile layout. They run together.
• The arrows should be hidden or changed to down arrows like we do for pipelines.

Screenshot:

[spadgett]

Also seems to be an extra table cell at the bottom.

[juanvallejo]

@spadgett

It's not clear where each row ends in the mobile layout. They run together.

Hm, this seems to be happening because the traffic-table directive has the ng-repeat attribute on the <tr> tag rather than on the <tbody>. pods-table and app/views/browse/routes.html both have ng-repeat on the <tbody>.

cc @jwforres