Turn off blank-lines Solium rule (#1284)

* turn off blank-lines rule

* remove triple newlines

(cherry picked from commit 9b37104655)

contracts/access/Roles.sol

@@ -1,6 +1,5 @@
 pragma solidity ^0.4.24;
 
-
 /**
  * @title Roles
  * @dev Library for managing addresses assigned to a Role.

contracts/access/roles/CapperRole.sol

@@ -2,7 +2,6 @@ pragma solidity ^0.4.24;
 
 import "../Roles.sol";
 
-
 contract CapperRole {
   using Roles for Roles.Role;
 

contracts/access/roles/MinterRole.sol

@@ -2,7 +2,6 @@ pragma solidity ^0.4.24;
 
 import "../Roles.sol";
 
-
 contract MinterRole {
   using Roles for Roles.Role;
 

contracts/access/roles/PauserRole.sol

@@ -2,7 +2,6 @@ pragma solidity ^0.4.24;
 
 import "../Roles.sol";
 
-
 contract PauserRole {
   using Roles for Roles.Role;
 

contracts/access/roles/SignerRole.sol

@@ -2,7 +2,6 @@ pragma solidity ^0.4.24;
 
 import "../Roles.sol";
 
-
 contract SignerRole {
   using Roles for Roles.Role;