updated dtm analyzer, some memory improvement with vocabulary

vipra-cmd/src/main/java/de/vipra/cmd/file/DTMVocabulary.java

vipra-cmd/src/main/java/de/vipra/cmd/lda/DTMAnalyzer.java

vipra-cmd/src/main/resources/config.properties

vipra-util/src/main/java/de/vipra/util/ArrayUtils.java

vipra-util/src/main/java/de/vipra/util/Constants.java

vipra-util/src/main/java/de/vipra/util/model/Sequence.java