Top class for Lucene work; its called "LuceneEvaluator" and has just 3 methods to call:

- addData(text, category)
- query(text)
- evaluate(result of the query).
Merge commit '572b4802eb2021a7f1d8f3a9c94e1ca51430b6bd' into dev
Data extension for text classification: aprox. 40 more texts about sport.
NormalizeHelper: Change functionality in the treatment of the Url in the text: remove completely them.
10 new tweets about sport for the benchmarks of the text classifiers.
Creation of a new abstract class named TextClassificationBenchmark. This class contains the common methods to LuceneBenchmark and WekaBenchmark which now will extend this class
New functionality in CollectionHelper

1. max(collection)
2. sum(collection)
Finishing LuceneEvaluator (main class of the text classification with Lucene). Working version.
Refactor of LuceneEvaluator: added java-docs, remove unused code, reorder functions, rename variables and improve generally the code
Minnor changes on LuceneBenchmark
Merge branch 'dev' of github.com:raulmarcosl/Itafy into dev
minnor change in weka evaluator
Moving from utils.textSearch to utils.textClassificator.lucene and from utils.textClassificator to utils.textClassificator.weka