Email/query sort by size/from/to/subject

=== WHY

With the new specifications as an user i want to be able to sort by 'size' and 'from', 'to' and 'subject' properties, like this :

[[ "Email/query",{
  "accountId": "ue150411c",
  "comparator" : {
      "property": "from",
      "isAscending": true
}
}, "0" ]]

=== HOW

• accept the 'size' value in the 'propertyField' of the sort field of the request.
• accept the 'from' value in the 'propertyField' of the sort field of the request.
• accept the 'to' value in the 'propertyField' of the sort field of the request.
• accept the 'subject' value in the 'propertyField' of the sort field of the request.

=== DOD

• write an integration test demonstrating the sorting of the result by 'size' in both ascending and descending order
• write an integration test demonstrating the sorting of the result by 'from' in both ascending and descending order
• write an integration test demonstrating the sorting of the result by 'to' in both ascending and descending order
• write an integration test demonstrating the sorting of the result by 'subject' in both ascending and descending order
• write an integration test demonstrating that a unsupportedSort method error is return in case of unknown collation