Merge branch 'v2-prototype' of github.com:0xProject/0x-monorepo into v2-prototype

* 'v2-prototype' of github.com:0xProject/0x-monorepo:
  Rename some variables in multi_sig_with_time_lock.ts
  Remove extra awaitTransactionMinedAsync calls
  Apply changes to test/exchange/match_orders.ts
  Fix some unhandled promise rejections
  Add awaitTransactionMinedAsync after every sent transaction
  Add missing blockchainLifecycle calls to contracts tests

packages/contracts/test/exchange/signature_validator.ts

@@ -25,6 +25,12 @@ describe('MixinSignatureValidator', () => {
     let orderFactory: OrderFactory;
     let signatureValidator: TestSignatureValidatorContract;
 
+    before(async () => {
+        await blockchainLifecycle.startAsync();
+    });
+    after(async () => {
+        await blockchainLifecycle.revertAsync();
+    });
     before(async () => {
         const accounts = await web3Wrapper.getAvailableAddressesAsync();
         const makerAddress = accounts[0];