Add markup formatter preview for folder description textarea.
Merge pull request #1 from daniel-beck/add-folders-description-preview

Add markup formatter preview for folder description textarea.
[maven-release-plugin] prepare release cloudbees-folder-4.0.1
[maven-release-plugin] prepare for next development iteration
[JENKINS-20990] Removing jobConfigHistory integration; more sensibly lives in that plugin.
[maven-release-plugin] prepare release cloudbees-folder-4.1
[maven-release-plugin] prepare for next development iteration
Fixing copy-paste errors in Javadoc, and some minor warnings.
[JENKINS-20008] Using DirectlyModifiableTopLevelItemGroup.
ItemListener.fireOnDeleted
[JENKINS-20008] Using DirectlyModifiableTopLevelItemGroup.remove.
[JENKINS-18680] Comments.
Adding an action to move items such as jobs and folders.
Includes a simple synchronous implementation using Items.move,
and an extension point allowing plugins to contribute other behaviors.
[FIXED JENKINS-21113] Enforce subitem restrictions better.
[maven-release-plugin] prepare release cloudbees-folder-4.2
[maven-release-plugin] prepare for next development iteration
API actually merged toward 1.548.
Making RelocationHandler an abstract class as suggested by @kohsuke in #2.
Use a wildcard to indicate that a list is read-only.
I18N.