Jenkins ChangeSet for http://dev.digital-humanities.de/ci/job/DARIAH-Topics/250/

Add metadata module	by severin
#dariah_topics/mallet.py
+dariah_topics/meta.py
#IntegrationTest_txt_gensim.ipynb
#dariah_topics/evaluation.py
#dariah_topics/doclist.py
#dariah_topics/preprocessing.py
#dariah_topics/visualization.py