Update protobuff and template to handle text direction

Update protobuff and template to handle text direction

- Add field to distilled_page.proto
- Update html template to accept "dir" attribute on body

BUG=374404
Committed: https://crrev.com/0fdfe5748a4a0370e2c1b5b2fc90094de97f0a1f
Cr-Commit-Position: refs/heads/master@{#301372}

[mdjones, 2014-10-21 23:03:39]

mdjones@chromium.org changed reviewers:
+ cjhopman@chromium.org

[mdjones, 2014-10-21 23:09:51]

Please review my changes.

Thanks,
Matt

[cjhopman, 2014-10-22 22:16:10]

lgtm

[mdjones, 2014-10-27 15:05:18]

The CQ bit was checked by mdjones@chromium.org

[commit-bot: I haz the power, 2014-10-27 15:06:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/667323002/1

[commit-bot: I haz the power, 2014-10-27 15:51:51]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-27 15:52:30]

Patchset 1 (id:??) landed as
https://crrev.com/0fdfe5748a4a0370e2c1b5b2fc90094de97f0a1f
Cr-Commit-Position: refs/heads/master@{#301372}