Add website to mono repo, update packages to align with existing sub-packages, use new subscribeAsync 0x.js method

packages/website/ts/components/ui/simple_loading.tsx

@@ -0,0 +1,23 @@
+import * as React from 'react';
+import {colors} from 'material-ui/styles';
+import CircularProgress from 'material-ui/CircularProgress';
+
+export interface SimpleLoadingProps {
+    message: string;
+}
+
+export const SimpleLoading = (props: SimpleLoadingProps) => {
+    return (
+        <div className="mx-auto pt3" style={{maxWidth: 400, height: 409}}>
+            <div
+                className="relative"
+                style={{top: '50%', transform: 'translateY(-50%)', height: 95}}
+            >
+                <CircularProgress />
+                <div className="pt3 pb3">
+                    {props.message}
+                </div>
+            </div>
+        </div>
+    );
+};