Add move node pipe

## Objective
- Be able to move a directory which is registered to a node list.

## Summary
- Add `move_node`. Following two functions are also added for this pipe.
- Add `prefix_path` filter which is able to filter a node list by a prefix of path.
- Add `change_path`. It is able to only change a path of node.

## PR status
- related to #92

Definitly.
I confirm `path_expand` strips '/' through `os.path.abspath`.