Summary:
Permit "j" and "k" to cycle through individual changeblocks, similar to how this
feature works in ReviewBoard. This still needs a bunch of refinement but it's
getting closer to being useful.
Also moved reticle underneath the table so you can click links through it (derp
derp).
Test Plan:
Used "j" and "k" to cycle through individual changes.
Reviewed By: aran
Reviewers: aran, jungejason, tuomaspelkonen
CC: moskov, aran, epriestley
Differential Revision: 426
921164aab7