Add BitKeeper support to Hudson
For polling, the plugin queries the parent repo for the latest CSETKEY. Any change there triggers a build.
For checkout, there is a configuration option to use 'pull' or 'clone' In a clean workspace, a clone is always performed. For pull, the repository is preserved between runs, and only a pull is performed. If 'pull' is not used, the target repository directory is deleted before performing a new clone.
ChangeSet parsing is done with a custom 'log' format. It tracks individual changesets, and retrieves the comment and user associated with the changeset. It does not yet display the file names that were changed in a changeset.
Tagging the parent repo via Hudson is not supported.