Refactoring on SKOSSimDisambiguator

Fixing similarityUri to use normalizeVector instead of an internal implementation
PorterStemmer and PhoneticAnalyzer  experiments

- I've made some experiments with PorterStemmer  to build SKOS TreeMap, but the results was inconclusive.
- PhoneticAnalyzer (TODO) -  need to build a solution that can be used for any analyzer
Removing unsed method (getSpotsFrequency)
Creating an URI->Spot mapping
Refactoring on SKOSSimTagExtractor