patch for MaltParser pipeline issue

A patch for #431, Malt Parser output broken for English. 

Temporary patch for MaltParser English pipeline. --- Previously, MaltParser expected (pure) PennTree POS tags, while TreeTagger provided additional POS tags. 

This patch resolves this by using POS tags provided by OpenNLPPosTagger. (lemma is still using TreeTagger). --- this is only a temporary solution, since we would prefer TreeTagger POS tagger. Final patch using PosMapper (of DKPro 1.5 and 1.6) will be added after the update of DKPro (#436). 

Anyhow, now Malt Parser works correctly on English (while a bit not very optimal).