rename checkLogin() to checkConnection(), fix use of MongoBSONEncoder instead of bson_new_from_json,  performBasicClientCommand and  performBasicDatabaseCommand JSON String version reuse DocumentData version
rename checkLogin() to checkConnection(), fix use of MongoBSONEncoder instead of bson_new_from_json,  performBasicClientCommand and  performBasicDatabaseCommand JSON String version reuse DocumentData version

matfur92/SwiftMongoDB,Danappelxx/SwiftMongoDB,matfur92/SwiftMongoDB,matfur92/SwiftMongoDB,matfur92/SwiftMongoDB