Log Message:
Update to 0.9.22:

Overview of changes leading to 0.9.22
Thursday, October 3, 2013
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- Fix use-after-end-of-scope in hb_language_from_string().
- Fix hiding of default_ignorables if font doesn't have space glyph.
- Protect against out-of-range lookup indices.

- API Changes:

  * Added hb_ot_layout_table_get_lookup_count()