Handle all stars seasons better

[calum]

At the moment, it is easy to error when asking about an all stars season

e.g. who won all stars 2?

Request:

{
  "session": {
    "new": false,
    "sessionId": "SessionId.f7cb34fd-5142-4b48-a6a6-dc069c759e3a",
    "application": {
      "applicationId": "amzn1.ask.skill.fb63dcb7-fdbf-457c-ad1e-614f084a7bfb"
    },
    "attributes": {},
    "user": {
      "userId": "amzn1.ask.account.AFWLHQHHME6UWKTLJR4H6UZZWZBNXIOXVXRKGAT452CANEGOU6CUTNYHOSA2IFKS7XWBDFC6JZNXSZV6FARFEUQKTWKXMLW2JVJJOOME6FWSVJCUJGWSP7RT7JEVC5AXHXDSX4UJ55MDVZJVA7XKTGKLKCLSXZEJKNTZDSRS4TCPEVRKNGIG6I26SCQCTG42JPWFJA4RRYGAVTI"
    }
  },
  "request": {
    "type": "IntentRequest",
    "requestId": "EdwRequestId.3d3ccb5b-5711-4940-9dde-b729df1d9556",
    "intent": {
      "name": "getwinnerfromseason",
      "slots": {
        "season_number": {
          "name": "season_number",
          "value": "all stars 2"
        }
      }
    },
    "locale": "en-GB",
    "timestamp": "2017-10-28T23:18:24Z"
  },
  "context": {
    "AudioPlayer": {
      "playerActivity": "IDLE"
    },
    "System": {
      "application": {
        "applicationId": "amzn1.ask.skill.fb63dcb7-fdbf-457c-ad1e-614f084a7bfb"
      },
      "user": {
        "userId": "amzn1.ask.account.AFWLHQHHME6UWKTLJR4H6UZZWZBNXIOXVXRKGAT452CANEGOU6CUTNYHOSA2IFKS7XWBDFC6JZNXSZV6FARFEUQKTWKXMLW2JVJJOOME6FWSVJCUJGWSP7RT7JEVC5AXHXDSX4UJ55MDVZJVA7XKTGKLKCLSXZEJKNTZDSRS4TCPEVRKNGIG6I26SCQCTG42JPWFJA4RRYGAVTI"
      },
      "device": {
        "supportedInterfaces": {}
      }
    }
  },
  "version": "1.0"
}

[calum]

closed by #20