Static Metric build method.

[mpkorstanje]

The current builder is a bit verbose:

        StringMetric metric = new StringMetricBuilder()
                .with(new CosineSimilarity<String>())
                .simplify(new CaseSimplifier.Lower())
                .tokenize(new QGramTokenizer(2))
                .build();

Could be much shorter by using import static org.simmetrics.StringMetricBuilder.with;

        StringMetric metric = with(new CosineSimilarity<String>())
                .simplify(new CaseSimplifier.Lower())
                .tokenize(new QGramTokenizer(2))
                .build();

[mpkorstanje]

Done.