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 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
Fix kwd of jsonio.save
Fix docstring style