[CDE-114] CDE Dashboards should show title in file browser instead of file name; cde-spring.xml (cde-pentaho/cde-pentaho5) now declares a IFileHandler implementation, which is now the class responsible for file handling operations (currently only holds saveDashboardAs); cde-pentaho5 extended cde-core's ICdeEnvironment, and cde-pentaho5's PentahoCdeEnvironment now implements ICdeEnvironmentExtended, allowing extension for 5.0 specific operation necessities;