refactoring Metadata class
change date format
change calling method construct MetaData Object
#16 implement page diplaying all slides
go clicking page button #16
#16 all slide view implement in debug haml
#16 implement toggle button for displaying all slide
#16 change displaying all slide
#16 pointing selected slide in all slide page
#16 implement spoting current slide in all slide page
#16 refactor name
#16 complete implementing