Add dateYMD() shortcut method for yyyy-mm-dd, no matter which culture
More documentation updates
Add DateTools to the list of things that are included by "using Dates;"
Many small changes to Dates (fix for snapToWeekday(), new helpers)

Dates.snapToWeekDay can now specify if you are snapping forward, backward
or to the current week.  If it's to the current week, you can specify
what the starting day of the week is.

Default mode = snap to current week.
Default start day = Sunday (0)

Everything else is small stuff
 * number of days in months
 * is Leap year?
 * delta day/week/month/year
 * (prev/next)(week/month/year), tomorrow, yesterday