Enable hot-reload and development mode to make web changes less painful.

runserver.py

@@ -1,5 +1,19 @@
 #!env/bin/python
 from i2p2www import app
+import os
+
+# This code enable hot-reload of content and eliminates the
+# need of restarting the server for changes in html files,
+# most likely python files as well.
+# To enable this, run with:
+# DEV=whatever ./runserver.py
+is_development = False
+try:
+  os.environ['DEV']
+  is_development = True
+except KeyError:
+  pass
+
 
 if __name__ == '__main__':
-    app.run(host='127.0.0.1', port=5000, debug=False)
+    app.run(host='127.0.0.1', port=5000, debug=is_development)