Add new control : VerifyStructure

[bcivel]

Add a control that allow to verify JSON structure of the response (in contexte of Call Service)

Value1 : Define JSON Structure (or URL to contract) ex :
{
"type": "object",
"properties": {
"siteId": {
"type": "integer",
"format": "int32"
},
"platformId": {
"type": "integer",
"format": "int32"
}
}

Value2 : Boolean : Fail if presence of object not defined in the contract