Request #67101: SolrDisMaxQuery Bigram Methods

proto SolrDisMaxQuery SolrDisMaxQuery::addBigramPhraseField(string field, float boost [, float slop])
proto SolrDisMaxQuery SolrDisMaxQuery::removeQueryField(string field)
proto SolrDisMaxQuery SolrDisMaxQuery::setBigramPhraseFields(string bigramFields)