UserNavigationTree added, closes #122
Refactored anything with SiteMap in the name to Sitemap, for
consistency.
UserNavigationTree fires v&Navigator when selection made. Closes #128
Refactoring - renaming components package to component
SitemapURIConverter added to alloww use of URIFragmentHandler without
introducing dependency.  Breadcrumb added. SitemapURIConverter and
Breadcrumb untested
Breadcrumb added, closes #123
Standardised on mixed case enums constants for I18N.  Modified
TextReaderSitemapProvider to ensure there is an enum for intermediate
pages (where a step in the tree is not defined)
Error in resource bundle call
UserNavigationTree has UIScope
I18NTest fixed - null can be returned
Documentation.  Extra output from console test
Improved testing
Breadcrumb and UserNavigationTree updated, see #122, see #123