Change version ranges to only support patch version increments

packages/contracts/src/contracts/current/multisig/MultiSigWallet/MultiSigWallet.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.10;
+pragma solidity ~0.4.10;
 
 /// @title Multisignature wallet - Allows multiple parties to agree on transactions before execution.
 /// @author Stefan George - <stefan.george@consensys.net>

packages/contracts/src/contracts/current/multisig/MultiSigWalletWithTimeLock/MultiSigWalletWithTimeLock.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.10;
+pragma solidity ~0.4.10;
 
 import { MultiSigWallet } from "../MultiSigWallet/MultiSigWallet.sol";
 

packages/contracts/src/contracts/current/multisig/MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress/MultiSigWalletWithTimeLockExceptRemoveAuthorizedAddress.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.10;
+pragma solidity ~0.4.10;
 
 import { MultiSigWalletWithTimeLock } from "../MultiSigWalletWithTimeLock/MultiSigWalletWithTimeLock.sol";
 

packages/contracts/src/contracts/current/protocol/Exchange/Exchange.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.14;
+pragma solidity ~0.4.14;
 
 import { TokenTransferProxy } from "../TokenTransferProxy/TokenTransferProxy.sol";
 import { Token_v1 as Token } from "../../../previous/Token/Token_v1.sol";

packages/contracts/src/contracts/current/protocol/TokenRegistry/TokenRegistry.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.11;
+pragma solidity ~0.4.11;
 
 import { Ownable_v1 as Ownable } from "../../../previous/Ownable/Ownable_v1.sol";
 

packages/contracts/src/contracts/current/protocol/TokenTransferProxy/TokenTransferProxy.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.11;
+pragma solidity ~0.4.11;
 
 import { Token_v1 as Token } from "../../../previous/Token/Token_v1.sol";
 import { Ownable_v1 as Ownable } from "../../../previous/Ownable/Ownable_v1.sol";

packages/contracts/src/contracts/current/test/DummyToken/DummyToken.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.18;
+pragma solidity ~0.4.18;
 
 import { Mintable } from "../Mintable/Mintable.sol";
 import { Ownable } from "../../utils/Ownable/Ownable.sol";

packages/contracts/src/contracts/current/test/MaliciousToken/MaliciousToken.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.18;
+pragma solidity ~0.4.18;
 
 import { ERC20Token } from "../../tokens/ERC20Token/ERC20Token.sol";
 

packages/contracts/src/contracts/current/test/Mintable/Mintable.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.18;
+pragma solidity ~0.4.18;
 
 import { UnlimitedAllowanceToken } from "../../tokens/UnlimitedAllowanceToken/UnlimitedAllowanceToken.sol";
 import { SafeMath } from "../../utils/SafeMath/SafeMath.sol";

packages/contracts/src/contracts/current/tokens/ERC20Token/ERC20Token.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.18;
+pragma solidity ~0.4.18;
 
 import { Token } from "../Token/Token.sol";
 

packages/contracts/src/contracts/current/tokens/Token/Token.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.18;
+pragma solidity ~0.4.18;
 
 contract Token {
 

packages/contracts/src/contracts/current/tokens/UnlimitedAllowanceToken/UnlimitedAllowanceToken.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.18;
+pragma solidity ~0.4.18;
 
 import { ERC20Token } from "../ERC20Token/ERC20Token.sol";
 

packages/contracts/src/contracts/current/tokens/WETH9/WETH9.sol

@@ -13,7 +13,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-pragma solidity ^0.4.18;
+pragma solidity ~0.4.18;
 
 contract WETH9 {
     string public name     = "Wrapped Ether";

packages/contracts/src/contracts/current/tokens/ZRXToken/ZRXToken.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.11;
+pragma solidity ~0.4.11;
 
 import { UnlimitedAllowanceToken_v1 as UnlimitedAllowanceToken } from "../../../previous/UnlimitedAllowanceToken/UnlimitedAllowanceToken_v1.sol";
 

packages/contracts/src/contracts/current/tutorials/Arbitrage/Arbitrage.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.19;
+pragma solidity ~0.4.19;
 
 import { Exchange } from "../../protocol/Exchange/Exchange.sol";
 import { EtherDelta } from "../EtherDelta/EtherDelta.sol";

packages/contracts/src/contracts/current/tutorials/EtherDelta/AccountLevels.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.19;
+pragma solidity ~0.4.19;
 
 contract AccountLevels {
     //given a user, returns an account level

packages/contracts/src/contracts/current/tutorials/EtherDelta/EtherDelta.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.19;
+pragma solidity ~0.4.19;
 
 import { SafeMath } from "../../utils/SafeMath/SafeMath.sol";
 import { AccountLevels } from "./AccountLevels.sol";

packages/contracts/src/contracts/current/utils/Ownable/Ownable.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.18;
+pragma solidity ~0.4.18;
 
 /*
  * Ownable

packages/contracts/src/contracts/current/utils/SafeMath/SafeMath.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.18;
+pragma solidity ~0.4.18;
 
 contract SafeMath {
     function safeMul(uint a, uint b)

packages/contracts/src/contracts/previous/ERC20Token/ERC20Token_v1.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.11;
+pragma solidity ~0.4.11;
 
 import { Token_v1 as Token } from "../Token/Token_v1.sol";
 

packages/contracts/src/contracts/previous/Ownable/Ownable_v1.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.11;
+pragma solidity ~0.4.11;
 
 /*
  * Ownable

packages/contracts/src/contracts/previous/SafeMath/SafeMath_v1.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.11;
+pragma solidity ~0.4.11;
 
 contract SafeMath_v1 {
     function safeMul(uint a, uint b)

packages/contracts/src/contracts/previous/Token/Token_v1.sol

@@ -1,4 +1,4 @@
-pragma solidity ^0.4.11;
+pragma solidity ~0.4.11;
 
 contract Token_v1 {
 

packages/contracts/src/contracts/previous/UnlimitedAllowanceToken/UnlimitedAllowanceToken_v1.sol

@@ -16,7 +16,7 @@
 
 */
 
-pragma solidity ^0.4.11;
+pragma solidity ~0.4.11;
 
 import { ERC20Token_v1 as ERC20Token } from "../ERC20Token/ERC20Token_v1.sol";