refactor max and min out of SafeMath

contracts/math/Math.sol

+pragma solidity ^0.4.11;
+
+/**
+ * @title Math
+ * @dev Assorted math operations
+ */
+
+contract Math {
+  function max64(uint64 a, uint64 b) internal constant returns (uint64) {
+    return a >= b ? a : b;
+  }
+
+  function min64(uint64 a, uint64 b) internal constant returns (uint64) {
+    return a < b ? a : b;
+  }
+
+  function max256(uint256 a, uint256 b) internal constant returns (uint256) {
+    return a >= b ? a : b;
+  }
+
+  function min256(uint256 a, uint256 b) internal constant returns (uint256) {
+    return a < b ? a : b;
+  }
+}

contracts/math/SafeMath.sol

@@ -29,21 +29,4 @@ library SafeMath {
     assert(c >= a);
     return c;
   }
-
-  function max64(uint64 a, uint64 b) internal constant returns (uint64) {
-    return a >= b ? a : b;
-  }
-
-  function min64(uint64 a, uint64 b) internal constant returns (uint64) {
-    return a < b ? a : b;
-  }
-
-  function max256(uint256 a, uint256 b) internal constant returns (uint256) {
-    return a >= b ? a : b;
-  }
-
-  function min256(uint256 a, uint256 b) internal constant returns (uint256) {
-    return a < b ? a : b;
-  }
-
 }