Adding new deploy target to rsync a given package to a given destination server

Adding new target, deploy, which will use the FileSyncTask to rsync a given package to a given destination server.

Adding a default property for `springboard.deploy.packages_url` (where the packages are fetched from). Requires the property `springboard.deploy.destination` (where the code is rsynced, e.g. `user@server:/path/to/destination`).

Adding excludesfile for the deploy.