Log Message:
Update to 0.9.5:

Overview of changes leading to 0.9.5
Sunday, October 14, 2012
====================================

- Synthetic-GSUB Arabic fallback shaping.

- Misc Indic improvements.

- Add build system support for pthread.

- Imported UCDN for in-tree Unicode callbacks implementation.

- Context-aware Arabic joining.

- Misc other fixes.

- New API:

  hb_feature_to/from-string()
  hb_buffer_[sg]et_content_type()