[Google Like Advanced Search]
    COMPLETED:
        I just added some google like advanced search features like:
            a. You can now search for "quoted multi word text";
            b. You can now exclude undesired results using the minus before a word, for example: google news -glass;
            c. The minus is also available for the quoted text: -"google news" glass;
            d. If no quotes or minus are provided, the behaviour should be exactly like before;

        To make the interface, I added a advanced_search=False parameter to the filter function.

    PENDING:
        Implement the advanced search to the watson.search function