v4.9.0

• All comments are written in English. (isssue #4)
• Move plugin files to dist/.
• Delete attr_name option because it is not used in anywhere the source code.
• Change the name of attributes to follow the rule of custom data attribute of HTML5.

Recommended (v4.9+)	Deprecated
data-name-format	name_format
data-id-format	id_format
data-empty-val	empty_val