Add add_comment pipes.
Add test.
Small fix in docstring
Change check_directory and introduce get_directory

Conflicts:
	lib/dataprocessor/utility.py
Add a class handle data
Rename DataHolder > DataHandler
Merge pull request #29 from kenbeese/add-comment

Add comment
Merge branch 'pr/28' into master.

Remove duplicate sentence.

Conflicts:
	bin/execute_all_test
Bug fixed.

In previous version, if path_expand get "~/hoge",
it return "/home/user/~/hoge".
Merge pull request #35 from kenbeese/bug-fixed-utility

Bug fixed.
Split error check of `manip` from execute.execute #36
Check keys in `mn`
Fix documents and refactor `run_list` > `node_list`
Merge pull request #37 from termoshtt/error_check_in_execute

Split error check of `manip` from execute.execute
Using unittest in execute_all_test.
Remove etreeio.py
Bug fixed.
Merge remote-tracking branch 'kenbeese/master' into figure_node2

Conflicts:
	sample/README.md