Support for ciManagement maven notifications.

In order to enable ciManagement maven notifications you have to check the
option "E-mail Notification" into the section "Build Settings" from the
job, and add a ciManagement section to the pom.xml with the following
settings:

ciManagement
|-- system=hudson (you have to put "hudson" here )
|-- ur=http://serverurl/
|-- notifiers
|----- notifier
|-------- type=mail (you have to put "mail" here)
|-------- sendOnError=true
|-------- sendOnFailure=true
|-------- sendOnSuccess>false
|-------- sendOnWarning>false
|-------- configuration
|------------ recipients=some.email@domain.org (recipients have the same
format of the same field in the Job configuration page)

You can override this configuration in any module of the maven proyect.

[FIXED JENKINS-1201]
[FIXED JENKINS-6421]