0.7.1

Added

• All references can now be obtained from the ReferenceMap via listReferences() (#73)
• Test against PHP 7.0 (nightly) but allow failures

Changed

• ListData::$start now defaults to null instead of 0 (#74)
• Replace references to HtmlRenderer with new HtmlRendererInterface

Fixed

• Fixed 0-based ordered lists starting at 1 instead of 0 (#74)
• Fixed errors parsing multi-byte characters (#78 and #79)