Log Message:
Update to 1.0.3:

Overview of changes leading to 1.0.3
Tuesday, September 1, 2015
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- Start of user documentation, from Simon Cozens!
- Implement glyph_extents() for TrueType fonts in hb-ot-font.
- Improve GPOS cursive attachments with conflicting lookups.
- More fixes for cluster-level = 1.
- Uniscribe positioning fix.