updates to data api

years!
first pass at supportting tweeting through admin
more improvements to data api
data api for items, sales, and deposits

can bin on days, months and years

or

can see the number of items sold on each hour, weekday, day, month
added vendors to boxes

much better for the shopping list prospects
improve timezone handling
Merge branch 'master' of github.com:um-cseg/chez-betty