Conflicts:

	changelog.html

Prevent NPE when a task is assigned to an executor which has disappeared
Thanks!

This reverts commit 9a1ad74b. The bits
aren't yet synchronized to central apparently.

Conflicts:

	changelog.html

This is also related to [JENKINS-9778].

[FIXED JENKINS-8214] Added a DISCOVER permission to allow anonymous users to be presented the login screen when accessing job URLs

[FIXED JENKINS-8214] Added a DISCOVER permission to allow anonymous users to be presented the login screen when accessing job URLs

[FIXED JENKINS-13564] If there is any problem when searching for user partipication in the build, end up more gracefully.

CauseOfBlockage not displayed when build blocked by QueueTaskDispatcher.canRun()

[JENKINS-10880] output the job when polling fails

if the root URL isn't configured, clients won't be able to find this, so might as well not advertise at all.

Fixed changelog

[FIXED JENKINS-13389] Moved "View as plain text" link on console output ...

use prefix to static resources not to pick up stale cache.

[FIXED JENKINS-13454] Optimize the plugin manager

[FIXED JENKINS-13387] Converted "Delete this build" buttons into links in the sidepanel

update to guava 12.0-rc1