Feature: Enable user specified template substitions

  -- on the commandline via the -s or --subs option
  -- in the .md-substitutions file
Feature: Number continuously across block types by default.
Bugfix: Properly clear numbering when at new section.
Cleanup:

  -- change some warn calls to debug calls.
  -- delete misleading meta-info from mdx_tolatex.py
  -- remove unused stuff
Bugfix: Make strong emphasis work when exporting to latex.
Feature: add img, ol, blockquote support to latex export.
Feature: Add support for \(, \[-style MathMode escapes.
Feature: Add support for definition headings after numbers in html.
Feature: Make references regular html links.
Feature: Add a kate syntax-hilighting file.
Add templates & javascript helpers to version control.
Add a gitignore file.
Misc: Warn about missing references.
Feature: Add more definition blocks.
Note: In the future, this should not be hardcoded.
BugFix: Fix latex rendering.
Misc: make laTeXRenderer a new-style class.