Port pelican to python 3.

Stays compatible with 2.x series, thanks to an unified codebase.

pelican/server.py

@@ -0,0 +1,20 @@
+from __future__ import print_function
+try:
+    import SimpleHTTPServer as srvmod
+except ImportError:
+    import http.server as srvmod
+
+try:
+    import SocketServer as socketserver
+except ImportError:
+    import socketserver
+
+PORT = 8000
+
+Handler = srvmod.SimpleHTTPRequestHandler
+
+httpd = socketserver.TCPServer(("", PORT), Handler)
+
+print("serving at port", PORT)
+httpd.serve_forever()
+