code: public void insertTimelineItem(TimelineItem item, String attachmentContentType, InputStream attachmentInputStream) throws IOException {
  		insertTimelineItem(item, attachmentContentType, ByteStreams.toByteArray(attachmentInputStream));
  	}
docs: Inserts an item with an attachment provided as an input stream.
  
  @param item
  the item to insert
  @param attachmentContentType
  the MIME type of the attachment (or null if none)
  @param attachmentInputStream
  input stream for the attachment (or null if none)