Improved rendering; comments in Markdown

• You can now use HTML comments in your Markdown files --- md4c-reader
  and pango-markup cooperate to remove those comments from the output (#28)
• pango-markup: Code blocks within bulleted or numbered lists are indented
• pango-markup: Consecutive headers have whitespace between them (#29)

Additionally:

• Added a changelog!
• Special blocks are now supported in core (#7)
• md4c-reader: special blocks can themselves include Markdown (#23)

Various improvements

Changes to the output

• 12-point fonts are actually 12 points now (they were larger before) (8cbb1be)
• Any image in a paragraph by itself, with a caption, will be rendered as a centered figure with that caption (#22)
• Code blocks now have light-gray backgrounds so they stand out more (#3)
• Accept GitHub-flavored Markdown and underlines. Now *italics* and _underline_, instead of _italics_.

Development changes

• Can now generate Debian packages (#12)
• Minimum valac now 0.48
  • Use valac from the Vala Next PPA on Travis

Font name; justification; space between paragraphs

• You can now specify a font name
• You can now specify left/center/right justification. (It currently applies to everything, which makes lists look a bit strange!)
• Paragraphs of body text now have whitespace between them.

Font size; dimensions in templates

User-facing changes

• You can now set the font size
• You can use dimensions in templates, e.g., 210mm instead of 8.2677 (inches).

Internal changes

• Much-improved test coverage
• Lightly-improved CONTRIBUTING.md

Add templates

User-facing changes

• Add --template to load a .pfft file specifying page size, margins, and header/footer text (#9)
• Add --quiet
• Convert logging to GStreamer. Now you can say GST_DEBUG='pfft:N' to set the debug level to N (0=none, 9=way too much)

Infrastructure changes

• Add lots more tests
• Check code coverage
• On successful Travis builds, report coverage to codecov.io

Initial release

• Read Markdown files containing headers, code blocks, images, lists
• Render PDFs

Source ("dist") tarball is attached --- if you don't want to clone the repo, you can download and untar, then install with ./configure && make && sudo make install. After installing, run pfft -h for help.

Enjoy!