Overview of changes between 1.15.0 and 1.15.1
==============================================
* Add Thai langauage engine. (currently makes tests/testboundary fail.)
* Add Lao and improved Thai sample text.
* Improved Indic module.
* Output correct path for hexboxes in pango_cairo_layout_path().
* Implement get_resolution method for the FT2 fontmap.  Shouldn't make
  any difference whatsoever.  Open a bug if it does.
* Misc small fixes.

* Optimizations:
  - Rework PangoLayout algorithms to avoid calling a recursive call to
    pango_layout_get_extents().  Avoids one pango_font_get_glyph_extents()
    call per glyph per layout rendering.  We now make 2 such calls.
  - Don't cache run_logical_rect in PangoLayoutIter.
    Avoids one pango_font_get_glyph_extents() call per glyph per layout
    rendering.  We are down to 1 now.
  - Cache line extents.  This avoids the final pango_font_get_glyph_extents()
    call per glyph per layout rendering.  Now we don't make any
    pango_font_get_glyph_extents() calls when rendering a layout (some
    conditions apply)!
  - Replace PANGO_IS_RENDERER with PANGO_IS_RENDERER_FAST for most
    internal uses, that is, just a NULL-check.
  - Use simple, fast, casts instead of PANGO_CAIRO_*() macros where the
    object cannot have reached us if it wasn't of the right type.

* Bugs fixed in this release:
	Bug 135683 – Cache glyphstring extents
	Red Hat Bug 211964: [ta] Rendering issue with Tamil
		Patch from LingNing Zhang
	Red Hat Bug 213632: ZWJ (200d) and ZWNJ (200c) showing same output
		Patch from LingNing Zhang
	Bug 371388 – Add Thai langauage engine
		Patch from Theppitak Karoonboonyanan
	Bug 377975 – bug in _pango_glyph_item_iter_next_cluster
	Bug 369670 – Checked g_free calls

Changes that also appeared between 1.14.7 and 1.14.8
=====================================================
* Improved thread-safety.  Pango is still NOT thread-safe, but this fixes
  lots of crashes using pangocairo from multiple threads.
* Fix out-of-bounds array access.
* Improved Indic shaper.
* Improved Arabic language engine.
* Choose shaper/font for unassigned Unicode codepoints.
* Build fixes.
* Bugs fixed in this release:
	Bug 356666 – pango is not thread-safe, nautilus does not honour that
	Bug 352795 – configure.in: Bug in "checking Whether to write
	             dependencies into .pc files"
	Bug 350132 – backspacing doesn't work properly for Arabic
	Bug 330407 – Multiple dependant vowel signs (indic) displayed as one
	Patch from LingNing Zhang