Refine utilities
Bug fix
Rename to InvalidJSONError
Fix comments and coding style
Bug fix and use DataProcessorError
Remove doctest executor since they cannot run alone
Add add_comment pipes.
Add test.
Add test.
Add other tests
Add some docstring
Change kwargs in io.save
Bug fix and add comments
Add pattern being False. #28
Fix treatment of Exception
Add some documents
Small fix about message
Add error handling
Split __init__.py into exception.py and execute.py
Fix docstring into numpy style