Added Snowball to POM
Added setLanguage and getLanguage to PreProcessor interface
Added setLanguage and getLanguage for SimplePreprocessor
Refactored SimplePreprocessor to use new utils
Added Numeral util for preprocessors
Added Punctuation util for preprocessors
Added PreProcessorUtil interface to tie together Preprocessor utils
Added StemmerCreationException
Added initial version of SnowballPreprocessor
Added initial tests for SnowballPreprocessor
Added tests for SimplePreprocessor setLanguage() and getLanguage()
Added tests for Corpus.getTimePartition()
Added tests for Numeral preprocessor util
Added tests for Punctuation preprocessor util
Added Snowball to CLI initialization