Small fixes for Unicode and file paths.
pattern.metrics macro-averaged precision & recall, specificity(), sensitivity(), roc(), auc()
update version number
update unit tests
update examples
refactored pattern.text (en/es/fr/de/nl)

- pattern.text, and all of the language submodules therein (e.g., pattern.en) has been refactored.
- pattern.text now has base classes from which all language submodules inherit:
	- Lexicon: known words for the part-of-speech-tagger
	- Morphology: rules for unknown words based on suffixes
	- Context: rules for unknown words based on surrounding words
	- Parser: base parser with a tokenizer, tagger, chunker, labeler and lemmatizer
	- Verbs: lexicon + rules for verb conjugation
	- Sentiment: lexicon for positive/negative polarity of words
	- tree.py (moved from pattern.en)
- pattern.en, pattern.es, pattern.fr, pattern.nl and pattern.fr have been simplified and streamlined by subclassing these classes.
- pattern.xx provides a template for adding a new language.