commonmark-java 0.5.0

Update to CommonMark spec 0.25:

• Changes how partially consumed tabs are handled.

Features and fixes:

• Add YAML front matter extension for document metadata blocks (#24), thanks to @chiwanpark
• Add information about delimiter character and length to delimiter nodes (#10), thanks to @pcj
• Make HTML rendering for nodes extensible (#35)
• Make AttributeProvider work for image and table nodes (#31)
• Add Android test project to build so that we won't break Android support (#38), thanks to @JinneeJ
• Fix blank line after empty list item to terminate list
• Fix nested bullet list indented with mix of tab and spaces (#41), thanks to @derari
• Fix package name in Javadoc, thanks to @jiakuan

ext-autolink: Update to autolink 0.4.0

• Treat more special characters as trailing delimiters to not include
  ">, "/> and "); at the end of URLs
• Fix unexpected link end with unfinished delimiter pairs in URLs
• Fix Android incompatibility by not using java.util.Objects

Extension API changes:

• Add support for asymmetric delimiters (#17): DelimiterProcessor#getDelimiterChar was split into getOpeningDelimiterChar and getClosingDelimiterChar
• Replace CustomHtmlRenderer with NodeRenderer which also allows overriding rendering for built-in node types (#35)