YUI and Loader build for latest Gallery build

Conflicts:
	build/loader-base/loader-base-coverage.js
Resolve conflicts with updated gallery tag.
Update HISTORY files with 13.7.2
Update metadata for 3.17.2
Patch Y.DataType.Date.parse to add support for parsing ISO 8601 formatted dates even on legacy browsers that don't support it natively (IE < 9)

Issue: COW-2498
Disable some of the date unit tests that fail in NZ timezones.