Merge commit '01b673a' as 'lectures'

Squashed 'lectures/' content from commit 2b1085b ...

git-subtree-dir: lectures
git-subtree-split: 2b1085b

• Removed lectures submodule.

• [lectures] Added amsmath.

• [ouexam] Updated FAQs.

• [ouexam] Corrected pdfpagemode parameter value.

• [ouexam] Corrected 2.4 release date.

• [ouexam] Added missing 2.4 release notes.

• [ouexam] Added new calculator instructions and merged 2.4 dev into master branch.

• [ouexam] Fixed non-functional running totals and added embargo class option.

• [ouexam] Updated documentation for 2.4 release.

• [lectures] Fixed incorrect Roman font in math mode.

• [ouexam] Merged Makefile fixes from master into dev.

• [ouexam] Fixed ancient misnamed make variable in installation instructions.

• [ouexam] Switched to pgfkeys instead of kvoptions.

• [ouexam] Initial not-working attempt to implement key-value options for environments.

• [ouexam] Added examsection* environment and better support for zero-mark questions.

• [lectures] Added \tinyskip macro.

• [lectures] Added document class for assignments.

• [lectures] Changed height of sans and mono fonts for XeLaTeX.

• [lectures] Tidied up XeLaTeX font handling and added font fix for digits in hyperlinks.

• [lectures] Added new course outline document class and updated common font initialisation.

• Added Otago Business School logo.

• [lectures] Added ability to include note references for numbered notes in the actual slides (when notes are generated).

• [ouexam] Changed how marks are positioned (closes #28).

• [ouexam] documentation updates.

• [ouexam] merged v2.3.2 bug fixes into dev branch.

• [ouexam] bug fix for crashing verbatim environments (2.3.2).

• [ouexam] updated history.

• New commits (2.3.1 README).