Merge branch 'development' into feature/testnet-faucets/order-dispenser

* development: (37 commits)
  Add dates to CHANGELOGs
  Change CHANGELOGs
  Add .editorconfig
  Fix a typo
  Temp
  Use forEach instead of map
  Add PR number
  Fix an exception when a signature collision happens
  Fix prettier
  Add regression tests
  Improve the comment and fix an exception
  Add missing comas
  Lerna-ignore tslint and tsconfig
  Update contract versions, fix tests
  Rename directories
  Rename previous contracts, fix imports, add nested file structure
  Move all contracts into a single directory
  Update import
  Fix import
  Get rid of suffixed contract versioning and replace it with a poor-mans package manager. Versions are stored locally, and are generated in a copy-on-write basis as required
  ...

5 files changed, 77 insertions, 0 deletions

diff --git a/packages/long-lived-subscriptions-test/Dockerfile b/packages/long-lived-subscriptions-test/Dockerfile
new file mode 100644
index 000000000..47d24ec08
--- /dev/null
+++ b/packages/long-lived-subscriptions-test/Dockerfile
@@ -0,0 +1,10 @@
+FROM node
+
+WORKDIR /src
+
+COPY package.json .
+RUN yarn install
+
+COPY . .
+
+CMD ["./lib/index.js"]
diff --git a/packages/long-lived-subscriptions-test/package.json b/packages/long-lived-subscriptions-test/package.json
new file mode 100644
index 000000000..ec45d631a
--- /dev/null
+++ b/packages/long-lived-subscriptions-test/package.json
@@ -0,0 +1,25 @@
+{
+    "name": "long-lived-subscriptions-test",
+    "version": "0.0.1",
+    "description": "",
+    "scripts": {
+        "build:watch": "tsc -w",
+        "build": "tsc",
+        "start": "node lib/index.js",
+        "clean": "shx rm -rf lib",
+        "lint": "tslint --project . 'src/**/*.ts'"
+    },
+    "dependencies": {
+        "0x.js": "^0.31.1",
+        "lodash": "^4.17.4",
+        "web3": "^0.20.0"
+    },
+    "devDependencies": {
+        "@0xproject/tslint-config": "^0.4.6",
+        "@types/lodash": "^4.14.86",
+        "shx": "^0.2.2",
+        "tslint": "5.8.0",
+        "typescript": "2.7.1",
+        "web3-typescript-typings": "^0.9.8"
+    }
+}
diff --git a/packages/long-lived-subscriptions-test/src/index.ts b/packages/long-lived-subscriptions-test/src/index.ts
new file mode 100644
index 000000000..2d79dcc89
--- /dev/null
+++ b/packages/long-lived-subscriptions-test/src/index.ts
@@ -0,0 +1,32 @@
+import { DecodedLogEvent, ExchangeEvents, LogFillContractEventArgs, ZeroEx } from '0x.js';
+import * as _ from 'lodash';
+import * as Web3 from 'web3';
+
+const zeroExConfig = {
+    networkId: 1,
+};
+
+const RPC_URL = 'https://mainnet.infura.io/T5WSC8cautR4KXyYgsRs';
+// const RPC_URL = 'https://mainnet.0xproject.com';
+
+const web3 = new Web3(new Web3.providers.HttpProvider(RPC_URL));
+const zeroEx = new ZeroEx(web3.currentProvider, zeroExConfig);
+
+const subscribe = () => {
+    console.log('subscribing...');
+    zeroEx.exchange.subscribe<LogFillContractEventArgs>(
+        ExchangeEvents.LogFill,
+        {},
+        (err: Error | null, event?: DecodedLogEvent<LogFillContractEventArgs>) => {
+            if (_.isNull(err)) {
+                console.log('EVENT');
+                console.log(event);
+            } else {
+                console.log('ERROR');
+                console.log(err);
+                subscribe();
+            }
+        },
+    );
+};
+subscribe();
diff --git a/packages/long-lived-subscriptions-test/tsconfig.json b/packages/long-lived-subscriptions-test/tsconfig.json
new file mode 100644
index 000000000..3d967d05f
--- /dev/null
+++ b/packages/long-lived-subscriptions-test/tsconfig.json
@@ -0,0 +1,7 @@
+{
+    "extends": "../../tsconfig",
+    "compilerOptions": {
+        "outDir": "lib"
+    },
+    "include": ["./src/**/*", "../../node_modules/web3-typescript-typings/index.d.ts"]
+}
diff --git a/packages/long-lived-subscriptions-test/tslint.json b/packages/long-lived-subscriptions-test/tslint.json
new file mode 100644
index 000000000..ffaefe83a
--- /dev/null
+++ b/packages/long-lived-subscriptions-test/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": ["@0xproject/tslint-config"]
+}