Implement aspen.serve

Makes the quickstart quicker; closes #441.

aspen/__init__.py

@@ -70,9 +70,10 @@
 from aspen.http.response import Response
 from aspen import json_ as json
 from aspen.logging import log, log_dammit
+from aspen.website import Website
 
 # Shut up, PyFlakes. I know I'm addicted to you.
-Response, json, is_callable, log, log_dammit
+Response, json, is_callable, log, log_dammit, Website
 
 dist = pkg_resources.get_distribution('aspen')
 __version__ = dist.version
@@ -92,3 +93,14 @@
 
 RENDERERS.sort()
 
+
+def serve(website, host=None, port=None):
+    """Serve a website.
+    """
+    import os
+    from wsgiref.simple_server import make_server
+
+    port = int(os.environ.get('PORT', '8080'))
+    server = make_server('0.0.0.0', port, website)
+    log_dammit("Greetings, program! Welcome to port {0}.".format(port))
+    server.serve_forever()

aspen/__main__.py

@@ -21,15 +21,8 @@
 from __future__ import print_function
 from __future__ import unicode_literals
 
-import os
-from aspen import log_dammit
-from aspen.website import Website
-from wsgiref.simple_server import make_server
-
+from aspen import serve, Website
 
 if __name__ == '__main__':
     website = Website()
-    port = int(os.environ.get('PORT', '8080'))
-    server = make_server('0.0.0.0', port, website)
-    log_dammit("Greetings, program! Welcome to port {0}.".format(port))
-    server.serve_forever()
+    serve(website)