- Add code for placing the features information on the frontend

- Add a Features service for examining feature flags on the frontend
- Add a directive (quay-requires) that matches feature flags and, if any one does not match, removes the element from the DOM
- Add a directive (quay-show) that injects the features into the scope so that expressions of the form "Features.BILLING || something" work out of the box to show/hide the element
- Add a directive (quay-classes) that allows for setting of CSS classes on an element based on feature expression(s) such as {"!BILLING": "active"} (e.g. the BILLING flag is set to false, add the class "active".

features/__init__.py

@@ -1,8 +1,14 @@
+_FEATURES = {}
+
 def import_features(config_dict):
   for feature, feature_val in config_dict.items():
     if feature.startswith('FEATURE_'):
       feature_name = feature[8:]
-      globals()[feature_name] = FeatureNameValue(feature_name, feature_val)
+      _FEATURES[feature_name] = globals()[feature_name] = FeatureNameValue(feature_name, feature_val)
+
+
+def get_features():
+  return {key: _FEATURES[key].value for key in _FEATURES}
 
 
 class FeatureNameValue(object):
@@ -14,7 +20,7 @@ class FeatureNameValue(object):
     return '%s => %s' % (self.name, self.value)
 
   def __repr__(self):
-    return self.value
+    return str(self.value)
 
   def __cmp__(self, other):
     return self.value.__cmp__(other)