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/src/migration.ts

@@ -5,6 +5,7 @@ import { TxData } from 'ethereum-types';
 import * as _ from 'lodash';
 
 import { artifacts } from './artifacts';
+import { ZERO_BYTES32 } from './constants';
 import {
     FullMigrationContract,
     InitialMigrationContract,
@@ -133,6 +134,7 @@ export interface FullFeaturesDeployConfig {
     wethAddress: string;
     stakingAddress: string;
     protocolFeeMultiplier: number;
+    greedyTokensBloomFilter: string;
 }
 
 /**
@@ -147,6 +149,7 @@ const DEFAULT_FULL_FEATURES_DEPLOY_CONFIG = {
     wethAddress: NULL_ADDRESS,
     stakingAddress: NULL_ADDRESS,
     protocolFeeMultiplier: 70e3,
+    greedyTokensBloomFilter: ZERO_BYTES32,
 };
 
 const DEFAULT_FULL_FEATURES_ARTIFACTS = {
@@ -189,6 +192,7 @@ export async function deployFullFeaturesAsync(
                 provider,
                 txDefaults,
                 artifacts,
+                _config.greedyTokensBloomFilter,
             )).address,
         signatureValidator:
             features.signatureValidator ||
@@ -206,6 +210,7 @@ export async function deployFullFeaturesAsync(
                 txDefaults,
                 artifacts,
                 _config.zeroExAddress,
+                _config.greedyTokensBloomFilter,
             )).address,
         nativeOrders:
             features.nativeOrders ||
@@ -218,6 +223,7 @@ export async function deployFullFeaturesAsync(
                 _config.wethAddress,
                 _config.stakingAddress,
                 _config.protocolFeeMultiplier,
+                _config.greedyTokensBloomFilter,
             )).address,
     };
 }