change navString to emit ISO 8601 date string of date that is >50% in view
change 'navigated' to emit array because two-week will have to emit array
change navString to array of two ISO 8601 strings representing the two-week view endpoints
replace '12 am' tick labels with 'Jan 1'-style dates
Merge branch 'master' into jebeck/one-day-navstring
bugfix: was emitting wrong beginning endpoint for two-week view
put back transform to lowercase in two-week view day labels
add default reverse sorting, with the option of regular sorting if sortReverse === false
Merge branch 'jebeck/one-day-navstring' into jebeck/issue43-two-week-reverse-sort

Conflicts:
	js/two-week.js
add a getter/setter for sortReverse