OAuth2 data provider crashes if "url" used instead of "baseUrl"

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Resolved in https://github.com/r3mus/IgniteEngine-iOS/commit/122a59afa5ba2c9080f5984bf2292bd9a31156d3

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For docs:

{
    "attributes": {
        "auth_type": "oauth2",
        "autoLoad.enabled": false,
        "http.headers.accept": "application/json",
        "oauth": {
            "client_id": "7MSWbvqGTF1gQ4bJinsamJA5ZAwTDcBY",
            "grant_type": "implicit",
            "redirect_uri": "http://localhost",
            "response_type": "token",
            "scope": "READ",
            "storage_id": "token_time"
        },
        "queryParams": {
            "client_logo": "https://ignite.apigee.com/demo/logoAnytel_300x75.png",
            "client_name": "Anytel",
            "color_0": "008981",
            "color_1": "007b74",
            "field_0": "Phone Number",
            "field_1": "PIN"
        },
        "tokenPath": "/v1/oauth/token",
        "url": "https://apigee-delta-test.apigee.net",
        "webViewPath": "/v1/oauth/samplelogingpage"
    }
}