* Fixed: (118) `{{ git.date }}` is now committer date (no longer author date).
* Added: new git info elements (author email, committer, committer email);
documentation was updated
* Added: by default, unknown variables in a markdown page (`{{ foo }}`)
are no longer replaced by blanks but displayed as is (DebugUndefined) (117);
for better compatibility with other plugins or error detection
* Added: `on_undefined` parameter in plugin definition to alter behavior
with unknown jinja2 variables: 'keep' (default), 'silent', 'strict', 'lax';
documentation was updated