Added notion of a general Store abstraction and wired it up in ClusterStore.
diff --git a/core/api/src/main/java/org/onlab/onos/store/package-info.java b/core/api/src/main/java/org/onlab/onos/store/package-info.java
new file mode 100644
index 0000000..7e767f0
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/store/package-info.java
@@ -0,0 +1,4 @@
+/**
+ * Abstractions for creating and interacting with distributed stores.
+ */
+package org.onlab.onos.store;
\ No newline at end of file