update README and HISTORY for dev branch
restored complete API compatibility with tokenizer module of 'textblob' main package and ensured consistent use of __future__.unicode_literals instead of u'' in tests.
added nltk_data to travis 'before_install'
major refactoring of textblob_de.blob.py to ensure consistent use of German models on all levels (TextBlob(), Sentence(), WordList(), Word()), adapted test_blob.py from textblob main package, raise NotImplementedError for methods/properties that do not yet have a German equivalent.
add missing 'import json'
added crucial option to include punctuation in .tags/.pos_tags property: TextBlob(text, tagger=PatternTagger(include_punc=True)), with tests
implemented BlobberDE class with initialized models for German and updated tests
updated README and removed debug print() statements
Merge remote-tracking branch 'origin/dev' prepare release 0.2.2
updated README and bumped version for 0.2.2 release