Updated Eve to 0.6.3

This also updates Cerberus to 0.9.2 and simplejson to 3.8.2.

I've also changed the way we get to the application object, by replacing
   from application import app
with
   from flask import current_app

pillar/settings.py

@@ -780,3 +780,4 @@ MONGO_PORT = os.environ.get('MONGO_PORT', 27017)
 MONGO_DBNAME = os.environ.get('MONGO_DBNAME', 'eve')
 CACHE_EXPIRES = 60
 HATEOAS = False
+UPSET_ON_PUT = False  # do not create new document on PUT of non-existant URL.