Added event when ownership of contract changes

contracts/staking/contracts/src/core/MixinFees.sol

@@ -72,18 +72,18 @@ contract MixinFees is
     }
 
     /// @dev Pays the rebates for to market making pool that was active this epoch,
-    ///      then updates the epoch and other time-based periods via the scheduler (see MixinScheduler).
-    ///      This is intentionally permissionless, and may be called by anyone.
+    /// then updates the epoch and other time-based periods via the scheduler (see MixinScheduler).
+    /// This is intentionally permissionless, and may be called by anyone.
     function finalizeFees()
         external
     {
-        // payout rewards
+        // distribute fees to market maker pools as a reward
         (uint256 totalActivePools,
         uint256 totalFeesCollected,
         uint256 totalWeightedStake,
         uint256 totalRewardsPaid,
         uint256 initialContractBalance,
-        uint256 finalContractBalance) = _payMakerRewards();
+        uint256 finalContractBalance) = _distributeFeesAmongMakerPools();
         emit RewardsPaid(
             totalActivePools,
             totalFeesCollected,
@@ -131,7 +131,7 @@ contract MixinFees is
     /// @return totalRewardsPaid Total rewards paid out across all active pools.
     /// @return initialContractBalance Balance of this contract before paying rewards.
     /// @return finalContractBalance Balance of this contract after paying rewards.
-    function _payMakerRewards()
+    function _distributeFeesAmongMakerPools()
         private
         returns (
             uint256 totalActivePools,

contracts/staking/contracts/src/core/MixinPools.sol

@@ -22,13 +22,10 @@ pragma experimental ABIEncoderV2;
 import "../libs/LibSafeMath.sol";
 import "../libs/LibSignatureValidator.sol";
 import "../libs/LibEIP712Hash.sol";
-
 import "../interfaces/IStructs.sol";
 import "../interfaces/IStakingEvents.sol";
-
 import "../immutable/MixinConstants.sol";
 import "../immutable/MixinStorage.sol";
-
 import "./MixinRewardVault.sol";
 
 
@@ -41,6 +38,10 @@ contract MixinPools is
 
     using LibSafeMath for uint256;
 
+    /// @dev This mixin contains logic for pools.
+    /// A "pool" can be delegated to by any number of stakers.
+    /// A market maker can create a pool 
+
     modifier onlyPoolOperator(bytes32 poolId) {
         require(
             msg.sender == getPoolOperator(poolId),

contracts/staking/contracts/src/core/MixinRewards.sol

@@ -37,6 +37,8 @@ contract MixinRewards is
 
     using LibSafeMath for uint256;
 
+    /// @dev This mixin contains logic for rewards 
+
     function withdrawOperatorReward(bytes32 poolId, uint256 amount)
         external
         onlyPoolOperator(poolId)

contracts/staking/contracts/src/interfaces/IStakingEvents.sol

@@ -62,4 +62,10 @@ interface IStakingEvents {
         uint256 initialContractBalance,
         uint256 finalContractBalance
     );
+
+    /// @dev Emitted by MixinOwnable when the contract's ownership changes
+    /// @param newOwner New owner of the contract
+    event OwnershipTransferred(
+        address newOwner
+    );
 }