Remove trailing whitespace in all contract files.

test/compilationTests/zeppelin/lifecycle/Destructible.sol

@@ -13,7 +13,7 @@ contract Destructible is Ownable {
   constructor() public payable { }
 
   /**
-   * @dev Transfers the current balance to the owner and terminates the contract. 
+   * @dev Transfers the current balance to the owner and terminates the contract.
    */
   function destroy() public onlyOwner {
     selfdestruct(owner);

test/compilationTests/zeppelin/lifecycle/TokenDestructible.sol

@@ -4,7 +4,7 @@ pragma solidity ^0.4.11;
 import "../ownership/Ownable.sol";
 import "../token/ERC20Basic.sol";
 
-/** 
+/**
  * @title TokenDestructible:
  * @author Remco Bloemen <remco@2π.com>
  * @dev Base contract that can be destroyed by owner. All funds in contract including
@@ -14,7 +14,7 @@ contract TokenDestructible is Ownable {
 
   constructor() public payable { }
 
-  /** 
+  /**
    * @notice Terminate contract and refund to owner
    * @param tokens List of addresses of ERC20 or ERC20Basic token contracts to
    refund.