v0.2.0

Added a chrono feature for enabling conversions to & from chrono types
Gave MonthShape a calendar() method for obtaining the associated Calendar
Gave MonthShape nth_date() and dates() methods for obtaining Date objects belonging to the month
New Date methods:
- pred() — returns the previous date
- succ() — returns the next date
- later() — returns an iterator over all later dates
- earlier() — returns an iterator over all earlier dates
- and_later() — returns an iterator that yields the receiver and all later dates
- and_earlier() — returns an iterator that yields the receiver and all earlier dates
Added a Weekday enum and a Date::weekday() method

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