Merge branch 'issues/73' of https://github.com/btakita/sapper-template into btakita-issues/73

src/routes/_error.html

@@ -6,6 +6,10 @@
 
 <p>{error.message}</p>
 
+{#if NODE_ENV === 'development'}
+	<pre>{error.stack}</pre>
+{/if}
+
 <style>
 	h1, p {
 		margin: 0 auto;
@@ -26,4 +30,12 @@
 			font-size: 4em;
 		}
 	}
-</style>
+</style>
+
+<script>
+	export default {
+		helpers {
+			NODE_ENV: process.env.NODE_ENV
+		}
+	};
+</script>