Added a destinations page, which lists all invoices from delivery windows in the same time frame
Re-grouped delivery windows by date and time.
Re-styled summaries page to accommodate this change.
Renamed url for destinations page
Removed debug statement; renamed file names in accordance with function names; changed dict comprehension to list comprehension
Included destinations.html; converted dict comprehension to list comprehension
Merge pull request #18 from this-username-is-taken/destinations

Destinations Page