minor modifications

circle/occi/admin.py

-from django.contrib import admin
-
-# Register your models here.

circle/occi/models.py

-from django.db import models
-
-# Create your models here.

circle/occi/occi_instances.py

@@ -215,8 +215,8 @@ CREDENTIALS_MIXIN = Mixin("http://circlecloud.org/occi/infrastructure#",
                           "credentials",
                           title="Credentials Mixin",
                           attributes=CREDENTIALS_ATTRIBUTES,
-                          applies="http://schemas.ogf.org/occi/infrastructure" +
-                          "#compute")
+                          applies="http://schemas.ogf.org/occi/" +
+                          "infrastructure#compute")
 
 OS_TPL_MIXIN = Mixin("http://schemas.ogf.org/occi/infrastructure#",
                      "os_tpl",

circle/occi/occi_utils.py

@@ -87,8 +87,8 @@ def validate_request(request, authentication_required=True,
     if has_data:
         # checking content type
         if request.META.get("CONTENT_TYPE") != "application/json":
-            raise OcciRequestNotValid("Only application/json content type is " +
-                                      "allowed.")
+            raise OcciRequestNotValid("Only application/json content type" +
+                                      " is allowed.")
         # checking if the data is a valid json
         try:
             data = json.loads(request.body.decode("utf-8"))

circle/occi/tests.py

-from django.test import TestCase
-
-# Create your tests here.