WebdavFileFactory add move and delete method
WebdavFileFactory add findProperty method
create ReplacePath and update Webdav vfs package
if not contains '.' with filename, then ExtractExtension return empty string;and add URLUtilsTest for content type
URLUtils can get content type from flv file
ExtractScheme when input empty or null String then return empty String and same with ExtractHost
HttpParameter add username and password for Authorization; WebdavFileFactory create mkdir method and exists method
WebdavFileFactory create isHidden for Folder and Data used
bug for HttpParameter when username is null