Add basic API endpoint for upgrades, partial pagination support

latter is still broken, but this much is a starting point i think

tailbone/api/master.py

@@ -26,6 +26,8 @@ Tailbone Web API - Master View
 
 from __future__ import unicode_literals, absolute_import
 
+from paginate_sqlalchemy import SqlalchemyOrmPage
+
 from tailbone.api import APIView, api
 from tailbone.db import Session
 
@@ -83,6 +85,15 @@ class APIMasterView(APIView):
             sortkey = getattr(self.model_class, sortkey)
             objects = objects.order_by(getattr(sortkey, sortdir)())
 
+            # NOTE: we only page results if sorting is in effect, otherwise
+            # record sequence is "non-determinant" (is that the word?)
+            page = self.request.params.get('page')
+            per_page = self.request.params.get('per_page')
+            if page.isdigit() and per_page.isdigit():
+                page = int(page)
+                per_page = int(per_page)
+                objects = SqlalchemyOrmPage(objects, items_per_page=per_page, page=page)
+
         data = [self.normalize(obj) for obj in objects]
         return data