Fix a variable name to init by a function 'span.reset'.
Merge pull request #56 from pubannotation/bugfix_load_spanless_annotation

Bugfix load spanless annotation.
Error occurs when an annotation without spans is loaded after an annotation with spans was loaded once.
Inner objects of the 'dataAccessObject' bind editor by  initiation.
Set a callback handlers of loaded and saved to the 'dataAccessObject' by the initiation.
Replace references to own functions from by object names to by function names.
Extract a file of the dataAccessObject.