Replaces `amount` with `value` for consistency (#1378)

* fixes #1372

* done in ERC20Capped and ERC20Mintable

(cherry picked from commit fd4de776)

contracts/token/ERC20/ERC20.sol

@@ -168,28 +168,28 @@ contract ERC20 is IERC20 {
    * an account. This encapsulates the modification of balances such that the
    * proper events are emitted.
    * @param account The account that will receive the created tokens.
-   * @param amount The amount that will be created.
+   * @param value The amount that will be created.
    */
-  function _mint(address account, uint256 amount) internal {
+  function _mint(address account, uint256 value) internal {
     require(account != 0);
-    _totalSupply = _totalSupply.add(amount);
-    _balances[account] = _balances[account].add(amount);
-    emit Transfer(address(0), account, amount);
+    _totalSupply = _totalSupply.add(value);
+    _balances[account] = _balances[account].add(value);
+    emit Transfer(address(0), account, value);
   }
 
   /**
    * @dev Internal function that burns an amount of the token of a given
    * account.
    * @param account The account whose tokens will be burnt.
-   * @param amount The amount that will be burnt.
+   * @param value The amount that will be burnt.
    */
-  function _burn(address account, uint256 amount) internal {
+  function _burn(address account, uint256 value) internal {
     require(account != 0);
-    require(amount <= _balances[account]);
+    require(value <= _balances[account]);
 
-    _totalSupply = _totalSupply.sub(amount);
-    _balances[account] = _balances[account].sub(amount);
-    emit Transfer(account, address(0), amount);
+    _totalSupply = _totalSupply.sub(value);
+    _balances[account] = _balances[account].sub(value);
+    emit Transfer(account, address(0), value);
   }
 
   /**
@@ -197,15 +197,15 @@ contract ERC20 is IERC20 {
    * account, deducting from the sender's allowance for said account. Uses the
    * internal burn function.
    * @param account The account whose tokens will be burnt.
-   * @param amount The amount that will be burnt.
+   * @param value The amount that will be burnt.
    */
-  function _burnFrom(address account, uint256 amount) internal {
-    require(amount <= _allowed[account][msg.sender]);
+  function _burnFrom(address account, uint256 value) internal {
+    require(value <= _allowed[account][msg.sender]);
 
     // Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,
     // this function needs to emit an event with the updated approval.
     _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(
-      amount);
-    _burn(account, amount);
+      value);
+    _burn(account, value);
   }
 }

contracts/token/ERC20/ERC20Capped.sol

@@ -27,19 +27,19 @@ contract ERC20Capped is ERC20Mintable {
   /**
    * @dev Function to mint tokens
    * @param to The address that will receive the minted tokens.
-   * @param amount The amount of tokens to mint.
+   * @param value The amount of tokens to mint.
    * @return A boolean that indicates if the operation was successful.
    */
   function mint(
     address to,
-    uint256 amount
+    uint256 value
   )
     public
     returns (bool)
   {
-    require(totalSupply().add(amount) <= _cap);
+    require(totalSupply().add(value) <= _cap);
 
-    return super.mint(to, amount);
+    return super.mint(to, value);
   }
 
 }

contracts/token/ERC20/ERC20Mintable.sol

@@ -11,18 +11,18 @@ contract ERC20Mintable is ERC20, MinterRole {
   /**
    * @dev Function to mint tokens
    * @param to The address that will receive the minted tokens.
-   * @param amount The amount of tokens to mint.
+   * @param value The amount of tokens to mint.
    * @return A boolean that indicates if the operation was successful.
    */
   function mint(
     address to,
-    uint256 amount
+    uint256 value
   )
     public
     onlyMinter
     returns (bool)
   {
-    _mint(to, amount);
+    _mint(to, value);
     return true;
   }
 }