Added pool thread in Lucene recommender. It now checks the set of falseitems before recommending them.
Added wrapper to ignore items previously seen by the user (UserFilterWrapper).
Created JsonUtils to encapsulate all JSON operations.
Added checking for the same item being recommended in PathRecommender
Included code in CategoryBasedRecommender (it recommends based on the item category).
Merge pull request #1 from abellogin/master

Added pool thread in Lucene recommender. It now checks the set of falsei...