1. The project package structure is reorganized.
2. Bing Search Api is used to retrieve search results
3. JSON library is used to parse resulting JSON object
1. Snippet class is updated to hold both url and description data in it
2. Clusterer class is added a sorting function to sort final cluster list acording to the num of documents they are holding
3. Main class's parseResult func is updtaed to reflect changes in Snippet class, and the clustering result is printed out properly