move the wagon with the manager out to a branch

As of this revision, the differences with the 1.x branch are:
- API changes in the Wagon interface
- resulting changes to events to add the repository parameters
- inclusion of the wagon manager

Ideally, the wagon manager would be ported to the Wagon 1.x trunk without the breaking API changes


git-svn-id: https://svn.apache.org/repos/asf/maven/wagon/branches/wagon-with-manager@573485 13f79535-47bb-0310-9956-ffa450edef68