add dictator.sol (#752)

* add backdoor.sol

* rename to Dictator

* bump version

contracts/schemes/Dictator.sol

@@ -0,0 +1,36 @@
+pragma solidity ^0.5.17;
+
+import "../controller/Avatar.sol";
+import "../controller/Controller.sol";
+import "@openzeppelin/upgrades/contracts/Initializable.sol";
+import "@openzeppelin/contracts-ethereum-package/contracts/ownership/Ownable.sol";
+
+/**
+ * @title A scheme for register other scheme with full permission.
+ */
+
+contract Dictator is Initializable, Ownable {
+
+    Avatar public avatar;
+
+    /**
+     * @dev registerScheme
+     * @param _scheme the scheme to register (with full permission)
+     */
+    function registerScheme(address _scheme) external onlyOwner {
+        //register a scheme with full permission :)
+        require(Controller(avatar.owner()).registerScheme(_scheme, 0x0000001f), "Fail to register scheme");
+    }
+
+    /**
+     * @dev _initialize
+     * @param _avatar the scheme avatar
+     * @param _owner the contract owner
+     */
+    function initialize(Avatar _avatar, address _owner) public initializer {
+        require(address(_avatar) != address(0), "Scheme must have avatar");
+        Ownable.initialize(_owner);
+        avatar = _avatar;
+    }
+
+}