fix(naivebayes): fix the algorithm to make it actually work

feat(cleanDocuments): preprocess documents, use stemming and stopword elimination for better accuracy

sibe.cabal

@@ -22,6 +22,10 @@ library
                      , deepseq
                      , containers
                      , split
+                     , regex-base
+                     , regex-pcre
+                     , text
+                     , stemmer
   default-language:    Haskell2010
 
 executable sibe-exe
@@ -53,6 +57,19 @@ executable example-naivebayes-doc-classifier
                      , split
   default-language:    Haskell2010
 
+executable example-naivebayes-sentiment-analysis
+  hs-source-dirs:      examples
+  main-is:             naivebayes-sentiment-analysis.hs
+  ghc-options:         -threaded -rtsopts -with-rtsopts=-N
+  build-depends:       base
+                     , sibe
+                     , hmatrix
+                     , containers
+                     , split
+                     , directory
+                     , deepseq
+  default-language:    Haskell2010
+
 test-suite sibe-test
   type:                exitcode-stdio-1.0
   hs-source-dirs:      test