Fix Remarkup sprite, tweak Transactions

Summary: This fixes the sprite for remarkup and does some minor tweaks for transactions (so Differential looks a little more like timeline)

Test Plan: tested remarkup, differential

Reviewers: epriestley, btrahan

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7418
Touch up comments are hidden box

Summary: Adds consistent spacing, color to this interactive box. Also, I changed it to yellow, if its too much lemme know but feels ok.

Test Plan: tested new colors in differential

Reviewers: epriestley

Reviewed By: epriestley

CC: Korvin, epriestley, aran

Differential Revision: https://secure.phabricator.com/D7422
Merge remote-tracking branch 'upstream/master'