New dispatcher

contract Dispatcher {
    address public dest;
    address owner;

    modifier only_owner(){
        if(msg.sender == owner){
            _;
        } else {
            revert();
        }
    }

    function Dispatcher(address _target) public {
       owner = msg.sender;
       dest = _target;
        _target.delegatecall(bytes4(keccak256("initialize()")));
    }
    
    function initialize() public{
        // Should only be called by on target contracts, not on the dispatcher
        revert();
    }

    function() public{
        var target = dest;  
        assembly {
            calldatacopy(0x0, 0x0, calldatasize)
            let a := delegatecall(sub(gas, 10000), target, 0, calldatasize, 0, 0)
            returndatacopy(0, 0, returndatasize)
            return(0, returndatasize)
        }
    }
    function replace(address _target) 
    public 
    only_owner
    {
        dest = _target;
        _target.delegatecall(bytes4(keccak256("initialize()")));
    }

}