Add new defaultRendition extension point to Rendition service

In the same way we are able to easily customize the download service's permission extension point (described in download-security-policies ), a new extension point allows to dynamically evaluate a default rendition to be generated for a given document. This evaluation is based on the JVM Nashorn javascript engine and looks like: <extension target= "org.nuxeo.ecm.platform.rendition.service.RenditionService" point= "defaultRendition" > <defaultRendition name= "nxDefaultRendition" > <script language= "JavaScript" > function run() { if (Reason == 'download' ) { if (Document.getType() == "File" ) { return 'mainBlob' ; } else if (Document.getType() == 'Folder' ) { return ''; } else { return 'xmlExport' ; } } else { return ''; } } </script> </defaultRendition> </extension> This default rendition is now used for bulk downloading documents. This way, users can easily customize how a document type can be rendered within the context of a bulk download. For instance, within a zip resulting from a bulk download, documents without any blob attached can be xml rendered, Picture documents will have their main blob rendered, Note will be rendered as PDF, etc. NOTE this new default rendition is downloadable under http://\ {host}:{port}/nuxeo/nxfile/default/{docId}/ url