6.0.0

• Changed: minimum PHP version is now 5.6
• Changed: you might now need to set an option to load files (security)
  • [\FluentDOM\Options\ALLOW_FILE => TRUE]
  • [\FluentDOM\Options\IS_FILE => TRUE]
• Changed: major cleanup/overhaul of the examples
• Refactored: Replace func_get_args() with variadics
• Added: HTML loader now supports 'html-fragment' and 'text/html-fragment'
• Added: XML/HTML loaders now support libxml options for the load methods
• Added: JsonDOM loader supports a callback for mapping keys to tag names
  The callback can be set using an option or JsonDOM::onMapKey().
• Changed: string arguments to methods like FluentDOM\Query::append() are now parsed as
  HTML fragments if the content type of the FluentDOM\Query instance is a HTML type.
• Changed: NULL values can now be set using FluentDOM\Query::attr(), FluentDOM\Query::css()
  and FluentDOM\Query::data() methods.
• Changed: FluentDOM\Nodes()/FluentDOM\Query() now keeps the content type used to load the
  document and use it for parsing fragments and serializing the document.
• Added: FluentDOM\Loadable::loadFragment()
• Added: FluentDOM\Text::replaceWholeText() and FluentDOM\CdataSection::replaceWholeText()
• Added: FluentDOM::registerSerializerFactory(), register function/factory to create
  a serializer for a node.
• Added: FluentDOM\Loader\Options generic options for loaders (source type)
• Added: FluentDOM\Exceptions\LoadingError exception interface