Make EmailArguments public to allow sending mails from plugins

With this minor change plugins would be able to send emails using Gerrit
internal API.

Change-Id: I289a7585a1090f281a0d4721ac13fb6ee12af2a4
Signed-off-by: Dariusz Luksza <dariusz@luksza.org>
Replace icon for merge commit

The new icon now shows a merge graph rather than a '!'.

Users might find the '!' scary and may think that they have done
something totally wrong.

The merge icon is based on the important icon from the Tango Icon
Library [1]

[1] http://tango.freedesktop.org/Tango_Icon_Library

Change-Id: I59904b894df9074444df8a7810f1f224a7e2f6aa
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
Merge "Replace icon for merge commit" into stable-2.9
Merge branch 'stable-2.9'

* stable-2.9:
  Replace icon for merge commit
  Make EmailArguments public to allow sending mails from plugins

Conflicts:
	gerrit-gwtui/src/main/java/com/google/gerrit/client/GerritResources.java

Change-Id: Icbf07da888ec07fc60409c1d987cf96359f3533d