Add entry_date field to Sleep document. This is to allow a timestamp for each entry date.
Change sleeps#update to output a hash of arrays containing the user's information.
Convert entry_date to localtime. It will be displayed as day and month, so it has to be the user's local time zone.
Change Sleep.get_results so it returns an array of hashes rather than one hash.
Refactor Sleep#get_results and include tests for changes to Sleep model and controller.
Display hours slept as bar graph.
Add text to hours bar graph.