0.6 JsDuck is now used for creating the official ExtJS4 documentation

• Automatic linking of class names found in comments. Instead of writing
  {@link Ext.Panel} one can simply write Ext.Panel and link will be
  automatically created.
• In generated docs, method return types and parameter types are also
  automatically linked to classes if such class is included to docs.
• Support for {@img} tag for including images to documentation.
  The markup created by {@link} and {@img} tags can now be customized using
  the --img and --link command line options to supply HTML templates.
• Links to source code are no more simply links to line numbers.
  Instead the source code files will contain ID-s like MyClass-cfg-style.
• New tags: @docauthor, @alternateClassName, @mixins.
  The latter two Ext4 class properties are both detected from code and
  can also be defined (or overriden) in doc-comments.
• Global methods are now placed to separate "global" class.
  Creation of this can be turned off using --ignore-global.
• Much improved search feature.
  Search results are now ordered so that best matches are at the top.
  No more is there a select-box to match at beginning/middle/end -
  we automatically search first by exact match, then beginning and
  finally by middle. Additionally the search no more lists a lot of
  duplicates - only the class that defines a method is listed, ignoring
  all the classes that inherit it.
• Support for doc-comments in SASS .scss files:
  For now, it's possible to document SASS variables and mixins.
• Several bug fixes.