Variables type in local cache mutations is not properly namespaced

[calvincestari]

When a local cache mutation has input variables the Variables type is not namespaced with GraphQLOperation and the build fails.

• apollo-ios SDK version: 1.0.2

Sample mutation with @apollo_client_ios_localCacheMutation directive:

uery PetSearchLocalCacheMutation($filters: PetSearchFilters = {
  species: ["Dog", "Cat"],
  size: SMALL,
  measurements: {
    height: 10.5,
    weight: 5.0
    }
  }
) @apollo_client_ios_localCacheMutation {
  pets(filters: $filters) {
    id
    humanName
  }
}

Expected:

public var __variables: GraphQLOperation.Variables? { ["filters": filters] }

Actual:

public var __variables: Variables? { ["filters": filters] }