including app.js with basic setup

public/index.html

@@ -7,5 +7,6 @@
 		<h1>Run Tracker</h1>
 		<svg></svg>
 		<script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script>
+		<script src="/js/app.js"></script>
 	</body>
 </html>

public/js/app.js

@@ -0,0 +1,7 @@
+var WIDTH = 800;
+var HEIGHT = 600;
+
+d3.select('svg').style({
+	height: HEIGHT,
+	width: WIDTH
+});