Add logging service documentation.

Add logging service documentation.

Just points to github.com/luci/luci-go/common/logging, but explains how that
works and meshes with the rest of the service definitions.

R=dnj@chromium.org, estaab@chromium.org, vadimsh@chromium.org
BUG=https://github.com/luci/gae/issues/22

Committed: https://github.com/luci/gae/commit/204a9a9fedfdd27ab6f6ab523d90a53220c2c23c

[Vadim Sh., 2015-12-13 21:22:15]

lgtm

[iannucci, 2015-12-14 01:37:04]

The CQ bit was checked by iannucci@chromium.org

[commit-bot: I haz the power, 2015-12-14 01:37:16]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-12-14 01:37:16]

This CL has an open dependency (Issue 1521823003 Patch 1). Please resolve the
dependency and try again.

[iannucci, 2015-12-14 08:49:55]

The CQ bit was checked by iannucci@chromium.org

[iannucci, 2015-12-14 08:49:55]

The patchset sent to the CQ was uploaded after l-g-t-m from vadimsh@chromium.org
Link to the patchset: https://chromiumcodereview.appspot.com/1526453002/#ps20001
(title: "rebase")

[commit-bot: I haz the power, 2015-12-14 08:50:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1526453002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1526453002/20001

[commit-bot: I haz the power, 2015-12-14 08:52:36]

Description was changed from

==========
Add logging service documentation.

Just points to github.com/luci/luci-go/common/logging, but explains how that
works and meshes with the rest of the service definitions.

R=dnj@chromium.org, estaab@chromium.org, vadimsh@chromium.org
BUG=https://github.com/luci/gae/issues/22
==========

to

==========
Add logging service documentation.

Just points to github.com/luci/luci-go/common/logging, but explains how that
works and meshes with the rest of the service definitions.

R=dnj@chromium.org, estaab@chromium.org, vadimsh@chromium.org
BUG=https://github.com/luci/gae/issues/22

Committed:
https://github.com/luci/gae/commit/204a9a9fedfdd27ab6f6ab523d90a53220c2c23c
==========

[commit-bot: I haz the power, 2015-12-14 08:52:37]

Committed patchset #2 (id:20001) as
https://github.com/luci/gae/commit/204a9a9fedfdd27ab6f6ab523d90a53220c2c23c