Use 'page_query_param' for pagination instead of hard coded page

*** What
- Use self.page_query_param to determine the query parameter to use for
  pagination
- Set the default page_query_param to 'page'
- Freeze fake-factory version to 0.7.4

*** Why
- Allow the use of different page query parameters to do pagination
- The latest version of fake-factory is now depreciated:
  https://pypi.python.org/pypi/fake-factory/9999.9.9

Author: Eric Hurst

requirements-development.txt

@@ -2,6 +2,6 @@
 pytest>=2.9.0,<3.0
 pytest-django
 pytest-factoryboy
-fake-factory
+fake-factory==0.7.4
 tox
 mock

rest_framework_json_api/pagination.py

@@ -14,13 +14,14 @@ class PageNumberPagination(PageNumberPagination):
     """
 
     page_size_query_param = 'page_size'
+    page_query_param = 'page'
     max_page_size = 100
 
     def build_link(self, index):
         if not index:
             return None
         url = self.request and self.request.build_absolute_uri() or ''
-        return replace_query_param(url, 'page', index)
+        return replace_query_param(url, self.page_query_param, index)
 
     def get_paginated_response(self, data):
         next = None
@@ -95,4 +96,4 @@ def get_paginated_response(self, data):
                 ('next', self.get_next_link()),
                 ('prev', self.get_previous_link())
             ])
-        })
+        })