Syntax highlighting prototype
Uses minted, very incomplete
Fall back to verbatim when no -shell-escape
Added `highlight` option
* `highlight` (default value `true`) enables syntax highlighting using `minted`
Highlight: fallback if minted.sty isn't found.
Bump version, fix syntax highlight spacing
* Bumped version to 1.1 in code.
* Fix syntax highlight spacing. Corner case: if there is a page
  break near the beginning of a code block, the key marker may
  stay on the page while the code follows after the break.
Add #3 to known issues, bump version in readme
Added code to replace color theme of highlighting
* Changed number styles to match in both modes
* Added massive block of code with colors from solarized (replace these!)
A hopefully good color theme for syntax highlighting
Merge pull request #4 from urdh/highlight

Syntax highlighting implemented. Closes #1, #4.