2.0.0
=====
* Support for ITS 2.0 Preserve Space data category
* Support for ITS 2.0 Locale Filter data category
* Support for ITS 2.0 External Resource data category
* Support for ITS 2.0 ID Value data category
* Support for ITS 2.0 parameters, including user overrides
* Support for ITS 2.0 local withinText attribute
* Fixed handling of localization note inheritance
* Fixed handling of namespace prefixes on elements
* Added option to retain entity references in PO files
* Added option to load external DTDs (Galen Charlton)
* Added built-in rules for DocBook 5
* Updated built-in rules to use ITS 2.0 Preserve Space and External
Resource instead of 1.x custom extensions
* Excluded editor remarks and comments in built-in DocBook and Mallard
rules with Locale Filter
* Made all DocBook *info children not within text in built-in rules
