Beginning of GAE port

Notes:
* Still unclear how we should handle secret information such as
  keys and tokens.
* app.wsgi better be renamed to app.py
* In GAE, we would have to use memcached, so Redis must be changed.
* For https, certificates will have to be handled differently :/

So we still can't just migrate to GAE, but this is a start, so I will
commit, and keep it.

refs #37

Makefile

@@ -3,4 +3,9 @@ update-trans:
 	pybabel update --input-file messages.pot --output-dir translations/ --locale ja --domain messages
 
 compile-trans:
-	pybabel compile --directory translations/ --domain messages
+	pybabel compile --directory translations/ --domain messages
+
+appengine-deploy:
+	# Note: If you are on OS X, and you are using homebrew python,
+	# you are going to get a weird error.
+	pip install -r requirements.txt -t lib

app.wsgi

@@ -30,14 +30,28 @@ class Config(object):
         with open(file, 'r') as f:
             self.cfg = json.load(f)
 
-        for section in ['OCTAV', 'REDIS_INFO', 'GITHUB', 'GOOGLE_MAP']:
+        sections = {
+            'OCTAV': ['debug', 'endpoint', 'key', 'secret'],
+            'REDIS_INFO': ['host','port', 'db'],
+            'GITHUB': ['client_id', 'client_secret'],
+            'GOOGLE_MAP': ['api_key']
+        }
+        for section in sections.keys():
             if not self.cfg.get(section):
                 raise Exception( "missing section '" + section + "' in config file '" + file + "'" )
         if self.cfg.get('OCTAV').get('BASE_URI'):
             raise Exception(
                 'DEPRECATED: {"OCTAV":{"BASE_URI"}} in config.json is deprecated.\
  Please use {"OCTAV":{"endpoint"}} instead and remove {"OCTAV":{"BASE_URI"}}.'
-        )
+            )
+
+        # Allow settings to be derived from environment
+        for section, subsections in sections.items():
+            for subsection in subsections:
+                v = os.getenv('%s_%s' % (section,subsection.upper()), None)
+                if not v:
+                    continue
+                self.cfg[section][subsection] = v
 
     def section(self, name):
         return self.cfg.get(name)
@@ -110,10 +124,14 @@ def index():
     key = "conferences.lang." + lang
     conferences = cache.get(key)
     if not conferences:
+        print("fetching..")
         conferences = octav.list_conference(lang=lang)
+        print(conferences)
         if conferences is None:
             raise HTTPError(status=500, body=octav.last_error())
         cache.set(key, conferences, 600)
+
+    print("rendering...")
     return template('index.tpl', {
         'pagetitle': 'top',
         'conferences': conferences,

appengine_config.py

@@ -0,0 +1,2 @@
+import vendor
+vendor.add('lib')