add support to unescaped data

[galalaly]

Can be used like so

var NoEscape = require("sql-query").NoEscape;
var location = new NoEscape('ST_GeomFromText("POINT(30.062629699707 31.249670028687)")');
query = app.db.driver.execQuery(
'INSERT INTO users(location) VALUES(?)',
[ location ],
function( err, data ) {
// do something
}
);