code: function generateCollectionFiles(fileName, collectionQuery, callback, ctx) {
              if (collectionQuery != null) {
                  var file = files[fileName];
                  var newFiles = {};
                  var fileExtension = file.prismic[collectionQuery].collection.fileExtension;
                  var fileSuffix = (fileExtension != undefined && fileExtension !== "")? "." + fileExtension:"";
                  // for every result in the collection query
                  for (var i = 0; i < file.prismic[collectionQuery].results.length; i++) {
  
                      // clone the file and replace the original collectionQuery results with the current result
                      var newFile = clone(file);
                      newFile.prismic[collectionQuery].results = [file.prismic[collectionQuery].results[i]];
  
                      // add the filename to the ctx object to make it available for use in the linkResolver function
                      ctx.path = fileName;
  
                      // use the linkResolver to generate the filename removing the leading slash if present
                      newFiles[(ctx.linkResolver(file.prismic[collectionQuery].results[i]) + fileSuffix).replace(/^\//g, '')] = newFile;
                  }
  
                  delete files[fileName];
                  _.extend(files, newFiles);
              }
  
              callback();
          }
docs: if any of the queries are designated the collection query, then generate a file for each of the results