Free standing images are now centered.
Improved the theorem example.
#compilation processes matches #cores.
Added support for starred section, sub-section, and sub-sub-section.
Added plugin for theorems.
Added theorem demo to 'demo.tex'.
Plugins now have guaranteed access to the parent node.
Updated Sphinx docu for plugins.
Improved theorem plugin.
Added LaTeX counter tracking for 'lemma', 'theorem', 'example',
'corollary', and 'definition' environments.
'span' and 'name' are now compulsory arguments for TreeNode constructor.
TreeNode constructor determines the most likely set of LaTeX counters
automatically and stores it in an instance attribute.
Salted LaTeX file now tracks LaTeX counter values for sectioning commands.
Stored counters in a global variable.
Plugins for theorems and sections utilise LaTeX counters instead of
their own.
Updated demo.tex.
Added 'proof' environment.
PEP8.
Updated version number.