Use http_build_query for query strings

[shadowhand]

This code should be using http_build_query.

[hajekj]

I don't believe that this can be done due to the nature of Graph API using OData, especially in the case where pagination using odata.nextLink is used. The format of the link can be following: directoryObjects/$/Microsoft.WindowsAzure.ActiveDirectory.User?$skiptoken=X'44537074020001000000213A41646D696E34404772617068446972312E6F6E6D6963726F736F66742E636F6D29557365725F31353365353064662D653930382D343836652D383133622D306335646566313666323334B900000000000000000000' and I think that building the query (adding parameter api_version there) using http_build_query wouldn't do any good.