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 } );