Fix/sell no lock (#575)

* sell is no longer limited by lock

* added test case

Author: leekt

contracts/Whitelist.sol

@@ -879,6 +879,7 @@ contract Whitelist is IWhitelist, Ownable, OperatorRole {
         // a more clear error message.
         require(balance >= _value, "INSUFFICIENT_BALANCE");
         require(
+          _isSell || 
           balance >= info.totalTokensLocked.add(_value),
           "INSUFFICIENT_TRANSFERABLE_BALANCE"
         );

test/whitelist/authorizeTransfer.js

@@ -235,6 +235,12 @@ contract("whitelist / authorizeTransfer", (accounts) => {
       );
     });
 
+    it("can sell: lockup", async () => {
+      await contracts.dat.sell(trader, "100000000", 1, {
+        from: trader,
+      });
+    });
+
     describe("after unlock", async () => {
       beforeEach(async () => {
         await time.increase(31);