Overview of changes between 1.17.1 and 1.17.2
==============================================
- Rename recently added pango_ot_ruleset_get_for() to
  pango_ot_ruleset_get_for_description().

- New engine API: pango_ot_ruleset_new_from_description().

- Treat Unknown script like Common and other non-"real" scripts.
  [Martin Hosken]

- Misc typo fixes [Peter Moulder]

- Bugs fixed in this release:

	Bug 443206 – PANGO_SCRIPT_UNKNOWN should not cause a run break
	Patch from Martin Hosken