bumped version for dev branch
using alpha release versions on dev branch in order for pip install -U to work correctly
added parser and experimental support for polarity detection
updated README, HISTORY and tests for PatternParser
carefully traced all external sources and referenced them with links and git commit ids --> credits to original authors and simplifying update tracking
provide TextBlobDE class with German defaults already initialized, updated 'de-sentiment.xml' with some additional intensifiers/modifiers and corrected some POS tags
add inflected forms to one adjective (schön) for testing purposes
vastly improved tokenization, consistent use of tokenizer for all tools, updated tests accordingly
corrected mistake in usage instructions
download nltk_data before running tests
removed debug print() statements
improved initialization of TextBlobDE class with default values and implemented workaround to be able to use parser's 'lemmata' keyword argument
updated readme, autopep8
updated readme
merged with dev v0.2.0a3