Remove IE 6 tweaks
De-couple DateLocale and continuousCalendar

Pass actual locale object instead of string
Add DateTime.toISODateString
Add possibility to set date selection as constructor parameter
Favor ternary operator
Cleanup js code from semicolons
Make test independent of current date
Prevent date labels wrap between week day and date
Fix randomly failing test
Improve mocha reporter layout
Build for version 4.7.0