EP: misc fixes (#38)

* `@0x/contracts-zero-ex`: Fix NativeOrdersFeature order hash cancellation not emitting proper maker.
`@0x/contracts-zero-ex`: Revert to original (deployed) ZeroEx/EP proxy implementation. Optimized one is now at `ZeroExOptimized.sol`.
`@0x/contracts-zero-ex`: Add gas limits to first `transferFrom()` call in `LibTokenSpender` and `UniswapFeature`.

* `@0x/contracts-zero-ex`: Update changelog

* disable `no-empty-blocks` solidity linter rule

* `@0x/contracts-zero-ex`: Use bloom filters of greedy tokens in token transfer logic
`@0x/contracts-zero-ex`: Turn `LibTokenSpender` into `FixinTokenSpender`.
`@0x/contracts-zero-ex`: Misc renames for consistency.

* `@0x/contracts-zero-ex`: Export `GREEDY_TOKENS` list

* rebase and update changelog

* `@0x/contracts-zero-ex`: Change bloom filter hash algo based on discussions

* `@0x/contracts-zero-ex`: Fix changelog

* update orders docs

* `@0x/contracts-zero-ex`: revert if allowance call fails in uniswap feature

Co-authored-by: Lawrence Forman <me@merklejerk.com>

contracts/zero-ex/test/features/liquidity_provider_test.ts

@@ -2,6 +2,7 @@ import { artifacts as erc20Artifacts, DummyERC20TokenContract } from '@0x/contra
 import { blockchainTests, constants, expect, verifyEventsFromLogs } from '@0x/contracts-test-utils';
 import { BigNumber, OwnableRevertErrors, ZeroExRevertErrors } from '@0x/utils';
 
+import { ZERO_BYTES32 } from '../../src/constants';
 import { IOwnableFeatureContract, IZeroExContract, LiquidityProviderFeatureContract } from '../../src/wrappers';
 import { artifacts } from '../artifacts';
 import { abis } from '../utils/abis';
@@ -64,6 +65,7 @@ blockchainTests('LiquidityProvider feature', env => {
             env.txDefaults,
             artifacts,
             sandbox.address,
+            ZERO_BYTES32,
         );
         await new IOwnableFeatureContract(zeroEx.address, env.provider, env.txDefaults, abis)
             .migrate(featureImpl.address, featureImpl.migrate().getABIEncodedTransactionData(), owner)

contracts/zero-ex/test/features/native_orders_feature_test.ts

@@ -10,7 +10,7 @@ import { fullMigrateAsync } from '../utils/migration';
 import { getRandomLimitOrder, getRandomRfqOrder } from '../utils/orders';
 import { TestMintableERC20TokenContract } from '../wrappers';
 
-blockchainTests.resets('LimitOrdersFeature', env => {
+blockchainTests.resets('NativeOrdersFeature', env => {
     const { NULL_ADDRESS, MAX_UINT256, ZERO_AMOUNT } = constants;
     const GAS_PRICE = new BigNumber('123e9');
     const PROTOCOL_FEE_MULTIPLIER = 1337e3;

contracts/zero-ex/test/features/simple_function_registry_test.ts

@@ -66,7 +66,7 @@ blockchainTests.resets('SimpleFunctionRegistry feature', env => {
 
     it('`rollback()` to zero impl succeeds for unregistered function', async () => {
         await registry.rollback(testFnSelector, NULL_ADDRESS).awaitTransactionSuccessAsync();
-        const impl = await registry.getFunctionImplementation(testFnSelector).callAsync();
+        const impl = await zeroEx.getFunctionImplementation(testFnSelector).callAsync();
         expect(impl).to.eq(NULL_ADDRESS);
     });
 

contracts/zero-ex/test/features/transform_erc20_test.ts

@@ -24,6 +24,7 @@ import {
     TestMintTokenERC20TransformerContract,
     TestMintTokenERC20TransformerEvents,
     TestMintTokenERC20TransformerMintTransformEventArgs,
+    TestTransformERC20Contract,
     TransformERC20FeatureEvents,
 } from '../wrappers';
 
@@ -49,7 +50,7 @@ blockchainTests.resets('TransformERC20 feature', env => {
             env.provider,
             env.txDefaults,
             {
-                transformERC20: (await TransformERC20FeatureContract.deployFrom0xArtifactAsync(
+                transformERC20: (await TestTransformERC20Contract.deployFrom0xArtifactAsync(
                     artifacts.TestTransformERC20,
                     env.provider,
                     env.txDefaults,