Make it possible to forget generated jobs

By default, the job-dsl-plugin will delete all previously created jobs that are not generated by the current build execution. Unchecking the new box "Manage jobs" disable this behavior, leaving previously generated jobs as is.
Make it possible to forget generated jobs

Follow quidryan's comment, we should not disable the updating of templates.
Fixed the perforce p4Tool field to properly update for custom tool definitions
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Bumping version after 1.12 release
  Fixing small docs changes
  Found problem with the name upstream
  Add alternative ways of calling p4 and extendedEmail, with less args
  Adding support for copy artifacts build step
Merge branch 'master' of https://github.com/jenkinsci/job-dsl-plugin
Make it possible to ignore existing jobs and choose action for deleted ones

Add all features discussed in pull request #26:
- possibility to ignore update to existing jobs
- when a deleted job is found, it can be either ignored, disabled (default) or deleted.
Merge pull request #26 from rborer/master

Make it possible to forget generated jobs
Merge pull request #31 from andrewharmellaw/master

Small addition to the SVN support - new localDir parameter and additional example config.xml snippet
JENKINS-16998 support ALWAYS condition for downstreamParameterized trigger
Merge pull request #32 from CoreMedia/JENKINS-16998

JENKINS-16998 support ALWAYS condition for downstreamParameterized trigger
Upgrading to Gradle 1.4
Code cleanups. Handle whitespace differences, Allow access to Node for testing, remove violation test code which was in the wrong place.
JENKINS-16931 Fixing canRoam to default correctly.
Merge pull request #30 from jmcgarr/master

Fixing a minor issue with Perforce client - p4Exec => p4Tool
Merge remote-tracking branch 'origin/master'
Use ignoreExisting to StringManagement
Merge pull request #33 from quidryan/master

JENKINS-16931 and Move to gradle 1.4
move chucknorris to publisher context
added support for Maven job type
removed debug output