Extended Quote definitions to allow two character Quotes.
Vim syntax highlighter: Quote definitions have precedence over lists (to stop e.g. * = '...' from being seen as a list item).
Included Markdown compatible **strong** quote in quote definition examples.
Vim syntax highlighter: Fixed double-quote highlighting.
Added tests for asymmetric two character quote definition.
Documentation: Fixed escaped list item.
Added test to check built-in quote definition modification.
Delete the single quote Quote definition example -- single quotes are commonly used for punctuation and there are to many anomalies with this simplistic example.
Bump version number.