Release Name: 1.2.0

Notes:
PNG is an almost-pure-ruby PNG library. It lets you write a PNG
without any C libraries.


Changes:
=== 1.2.0 / 2009-06-23

* 26 minor enhancements:

  * Add load_metadata flag to PNG.load to extract dimensions and depth.
  * Add pure-ruby versions back for png_join and png_crc.
  * Added Canvas#composite(canvas, x, y, style) with overwrite, underlay, overlay, and blend.
  * Added Canvas#each, passes x, y, color.
  * Added Canvas#extract.
  * Added Color#|, Background color is effective false.
  * Added Font#coordinates and cached each letter when extracted.
  * Added PNG::load_file.
  * Added reader tests.
  * Added tests for PNG::Font.
  * Added tests for PNG::load.
  * Added to/from hsv methods to Color.
  * Clean up tests to remove duplication.
  * Cleaned up Color#to_ascii to make much easier to read and extend.
  * Cleaned up a fair amount of code, removing as many raw literals as possible.
  * Color#blend is a simple averaging algorithm now.
  * Extended reader to include RGB as well, paving the way for grayscale.
  * Fake support for RGB as well as RGBA (default alpha to 255).
  * Made reader work again (was flipped and all sorts of broken).
  * Split out reader.
  * Switched to minitest.
  * Time to refactor PNG::Font to use #extract and #composite...
  * Updated Rakefile to new hoe capabilities.
  * Updated manifest.
  * metadata_only now cleaner.
  * read_IHDR now returns height, width instead of a canvas.

* 3 bug fixes:

  * Fixed example/lines and added text.
  * Fixes for 1.9.
  * Ignore color profile if it exists (fixes problems on osx screenshots).