chore(config): change aws region defaults for dev and prod (#154) r=@vladikoff,@philbooth

Fixes #153

config/default.json

@@ -3,7 +3,7 @@
     "baseuri": "http://127.0.0.1:8000/"
   },
   "aws": {
-    "region": "us-east-1"
+    "region": "us-west-2"
   },
   "bouncelimits": {
     "enabled": true,

config/dev.json

@@ -1,4 +1,7 @@
 {
+  "aws": {
+    "region": "us-east-1"
+  },
   "log": {
     "level": "normal",
     "format": "pretty"