Add caching support for PublishedFileHandler (#13574)
Add caching support for PublishedFileHandler similar to VaadinServlet.
Testing is done manually as browser caching is difficult to develop
tests for.
Change-Id: I314745766c9feb60758547dba77eb9e13976ce91
Localization services from serverside (AjaxApplicationManager), cached on clientside (LocaleService).
DateTimeService for all components, provides localised month and daynames etc.
New IDateField implementation: one superclass, which different proper implementations extend.
Partially working version of "calendar"-style for DateField.
svn changeset:1816/svn branch:trunk