Minor fix according to the review.
Merge pull request #112 from kenbeese/add-node

Add node
Update test utility.
Update test.
Hot fixed.
Add gh-pages.mk.
Update depeloper.md.
Bug fixed.
Merge pull request #124 from kenbeese/create-gh-pages

Upload API Reference
Adopt to the case when configure file does not exist

- don't force the existence of ~/.dataprocessor.ini
- remove create_configure_file
- refactoring
Add configure creator (dpinit)
Enable piping in dpmanip
Minor change in document.
Write document for parameters of rc.ArgumentParser
Rename get_parser into get_configparser
Add prefix_path filter and its test.
Add 'change_path' and its test.
Add pipes 'move_node' and 'change_path' and its test.
Some documents are changed and minor bugs are fixed.
Add exception of from_path.