[Persistence] Separate out cache

Move cache sources into their own bundle, for reuse with other
persistence adapters; specifically supports the persistence
adapter to the WARP Server, which is non-Couch but which will
want to use this cache. WTD-702.

platform/persistence/cache/bundle.json

@@ -0,0 +1,14 @@
+{
+    "name": "Persistence cache",
+    "description": "Cache to improve availability of persisted objects.",
+    "extensions": {
+        "components": [
+            {
+                "provides": "persistenceService",
+                "type": "decorator",
+                "implementation": "CachingPersistenceDecorator.js",
+                "depends": [ "PERSISTENCE_SPACE" ]
+            }
+        ]
+    }
+}

platform/persistence/cache/test/suite.json

@@ -0,0 +1,3 @@
+[
+    "CachingPersistenceDecorator"
+]

platform/persistence/couch/test/suite.json

@@ -1,5 +1,4 @@
 [
-    "CachingPersistenceDecorator",
     "CouchDocument",
     "CouchIndicator",
     "CouchPersistenceProvider"