new execute command

execute.js

/**
 * old depcrecated version
 */
client.execute(function(arg1,arg2){
    // do soemthing
},[arg1,arg2]);

// -----------------------------------------

/**
 * new execute command
 */
client.execute(function(){
    // do something
})
client.execute(function(a,b,c,d,e,f) {
    // do something
},a,b,c,d,e,f)
client.execute(function(a,b,c,d,e,f) {
    return Array.prototype.slice.call(arguments).join('');
},'a','b','c','d','e','f', function(err,res) {
    assert(res.value , 'abcdef');
})