Backport changes from Cloudproxy (#11)

src/log.ts

@@ -0,0 +1,19 @@
+let requests = 0
+
+const LOG_HTML: boolean = Boolean(process.env.LOG_HTML) || false
+
+export default {
+  incRequests: () => { requests++ },
+  html(html: string) {
+    if (LOG_HTML)
+      this.debug(html)
+  },
+  ...require('console-log-level')(
+    {
+      level: process.env.LOG_LEVEL || 'debug',
+      prefix(level: string) {
+        return `${new Date().toISOString()} ${level.toUpperCase()} REQ-${requests}`
+      }
+    }
+  )
+}