Replaced Solium in favor of Solhint (#1575)

* Adding solhint, working on style fixes.

* Upgraded to solhint 1.5.0.

* Removed all references to Solium

* Updated mocks to make the pass the new linter rules.

* Reformatted the .solhint.json file a bit.

* Removed Solium configuration files.

* Remove Solium dependency.

* Add comment explaing disabled time rule in TokenVesting.

* Revert to the old (ugly?) style.

* Revert SignatureBouncerMock style.

* Fix ERC165InterfacesSupported interface.

contracts/utils/Address.sol

@@ -19,7 +19,7 @@ library Address {
         // for more details about how this works.
         // TODO Check this again before the Serenity release, because all addresses will be
         // contracts then.
-        // solium-disable-next-line security/no-inline-assembly
+        // solhint-disable-next-line no-inline-assembly
         assembly { size := extcodesize(account) }
         return size > 0;
     }