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

`This` may mean the yielded node_list, but I cannot see it.
It should be revised as follows:

--

In the case when `pre_path` is "/foo/bar",
following paths remain (not filtered):

- /foo/bar
- /foo/bar/foo

, and following do not remain (filtered out):

- /foo/barfoo/hoge
- /bar/foo/bar/FOO