New "browse" UI

Also, separated out browse, ?meta, and ?module request handlers.

Fixes #82

modules/client/utils/format.js

@@ -0,0 +1,18 @@
+import formatBytes from 'pretty-bytes';
+
+export { formatBytes };
+
+export function formatNumber(n) {
+  const digits = String(n).split('');
+  const groups = [];
+
+  while (digits.length) {
+    groups.unshift(digits.splice(-3).join(''));
+  }
+
+  return groups.join(',');
+}
+
+export function formatPercent(n, decimals = 1) {
+  return (n * 100).toPrecision(decimals + 2);
+}