Galbar / JsonPath-PHP / #17

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Breaking change: Change how the recursive operator works

I found a bug in how the recursive operator works (thanks to issue 64).
It was only using the latest selected result (not the whole array) to
apply the recursive search on.

Once this was fixed, two existing tests failed. Both using the same
JsonPath `$.store..*[?(@..model == null)].color` on the following JSON
document:

    { "store": {
        "book": [
          { "category": "reference",
            "author": "Nigel Rees",
            "title": "Sayings of the Century",
            "price": 8.95,
            "available": true
          },
          { "category": "fiction",
            "author": "Evelyn Waugh",
            "title": "Sword of Honour",
            "price": 12.99,
            "available": false
          },
          { "category": "fiction",
            "author": "Herman Melville",
            "title": "Moby Dick",
            "isbn": "0-553-21311-3",
            "price": 8.99,
            "available": true
          },
          { "category": "fiction",
            "author": "J. R. R. Tolkien",
            "title": "The Lord of the Rings",
            "isbn": "0-395-19395-8",
            "price": 22.99,
            "available": false
          }
        ],
        "bicycle": {
          "color": "red",
          "price": 19.95,
          "available": true,
          "model": null,
          "sku-number": "BCCLE-0001-RD"
        }
      },
      "authors": [
        "Nigel Rees",
        "Evelyn Waugh",
        "Herman Melville",
        "J. R. R. Tolkien"
      ],
      "Bike models": [
        1,
        2,
        3
      ]
    }

After a long analysis I have realized that the test was wrong. Let's
break that down:

1. `$` selects the whole json.

2. `.store` selects the value for the key "store":

    {
      "book": [
        { "category": "reference",
          "author": "Nigel Rees",
          "title": "Sayings of the Century",
          "price": 8.95,
          "availab... (continued)

19 of 19 new or added lines in 2 files covered. (100.0%)

403 of 406 relevant lines covered (99.26%)

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