Update CHANGELOG date (apple#625)

Update changelog with latest changes (apple#600)

Update changelog for 1.2.3 release (apple#580)

Update changelog for 1.2.2 release (apple#549)

Update changelog for 1.2.1 release (apple#540)

Update changelog for 1.2.0 release (apple#518)

Update changelog for 1.2.0 release and
update README code sample for latest version

Resolves apple#500.

Update changelog for 1.1.4 release (apple#478)

Changelog entry for release 1.1.3 (apple#452)

Update changelog for 1.1.2 release (apple#441)

Update changelog for the 1.1.1 release (apple#428)