code: public static Object fromReader(Reader reader) throws IOException {
          final JsonParser jp = JSON_FACTORY.createParser(reader);
          return fromJsonParser(jp);
      }
docs: Parses a JSON-LD document from the given {@link Reader} to an object that
  can be used as input for the {@link JsonLdApi} and
  {@link JsonLdProcessor} methods.
  
  @param reader
  The JSON-LD document in a Reader.
  @return A JSON Object.
  @throws JsonParseException
  If there was a JSON related error during parsing.
  @throws IOException
  If there was an IO error during parsing.