Merge pull request #25 from G8XSU/longerKeys

Allow Longer keys upto 600 chars

Author: G8XSU

app/src/main/java/org/vss/impl/postgres/sql/v0_create_vss_db.sql

@@ -1,6 +1,6 @@
 CREATE TABLE vss_db (
     store_id character varying(120) NOT NULL CHECK (store_id <> ''),
-    key character varying(120) NOT NULL,
+    key character varying(600) NOT NULL,
     value bytea NULL,
     version bigint NOT NULL,
     PRIMARY KEY (store_id, key)