Tag build swift-DEVELOPMENT-SNAPSHOT-2016-10-25-a

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Tag build swift-DEVELOPMENT-SNAPSHOT-2016-10-17-a

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Tag build swift-DEVELOPMENT-SNAPSHOT-2016-10-12-a

Add Calendar fixes for Swift 3 (swiftlang#686)

* Retain localeID when constructing a Calendar

The Calendar destructor releases stored values when the
Calendar is being deallocated, including releasing the localeID.

By default this is an empty string (kCFEmptyString) which results
in multiple Calendars causing a fault when it is over-released.
Ensure that instead the localeID is retained to balance the
release when it is cleaned up.

Issue: SR-2879

* Add support for ISO8601 calendar and others (swiftlang#677)

The list of valid keys did not include the ISO8601 calendar, which
meant that code running on Linux that used it would fail. Fix this
by adding the kCFISO8601Calendar and others into the list of known
constants valid for calendars, and add tests for the Gregorian
calendar, as well as for creating all other calendars.

Issue: SR-2551

Tag build swift-DEVELOPMENT-SNAPSHOT-2016-10-07-a