Add support of sample sentence from OpenNLP site

[sergmain]

reference https://opennlp.apache.org/docs/1.6.0/manual/opennlp.html#tools.parser points to docu with sentence "The quick brown fox jumps over the lazy dog ."
This sentence is represented as
(TOP (NP (NP (DT The) (JJ quick) (JJ brown) (NN fox) (NNS jumps)) (PP (IN over) (NP (DT the) (JJ lazy) (NN dog))) (. .)))

The current implementation of parser-triples can't extract any triples from this sentence.