Adding integration tests for GETREF and SLICE over JSON.

This commit also includes a change to IntraService. The SET op typically looks
like,

{
  "type": "SET",
  "op": {
    "rowkey": "row_key1",
    "name": "column1",
    "value": "value1"
  }
}

but when using GETREF it looks like,

{
  "type": "SET",
  "op": {
    "rowkey": "getref_test",
    "name": "col3",
    "value": {
      "type": "GETREF",
      "op": {
        "resultref": 4,
        "wanted": "value"
      }
    }
  }
}

In this case the value attribute references a nested GETREF op. With the
default JSON deserialization, the nested GETREF is getted deserialized as a
Map instead of a IntraOp. I have added logic in InstraService to handle the
nested map.
Timeout ops
Test coverage of the spify new timeout feature.
White space
Note for Nate, and others who actually understand performance
Adding integration tests for GETREF and SLICE over JSON.

This commit also includes a change to IntraService. The SET op typically looks
like,

{
  "type": "SET",
  "op": {
    "rowkey": "row_key1",
    "name": "column1",
    "value": "value1"
  }
}

but when using GETREF it looks like,

{
  "type": "SET",
  "op": {
    "rowkey": "getref_test",
    "name": "col3",
    "value": {
      "type": "GETREF",
      "op": {
        "resultref": 4,
        "wanted": "value"
      }
    }
  }
}

In this case the value attribute references a nested GETREF op. With the
default JSON deserialization, the nested GETREF is getted deserialized as a
Map instead of a IntraOp. I have added logic in InstraService to handle the
nested map.
Merge pull request #80 from jsanda/json-itests

Adding integration tests for GETREF and SLICE over JSON.