t/Util.pl: use DBI
fixed bug for remark, updated schema and added methods for table relationship.

 - bugfix: find_or_create_status remarks RT
           if RT's original tweet is already favorited/reteeted

 - updated schema:
   - status: added index (user_id, created_at) and year 2014 partitions
   - remark: added column status_user_id

 - added relationship methods:
   - Row::Status: remarked, favorited, retweeted
   - Row::User: remarks, favorites, retweets,
                remarked, favorited, retweeted
   - Row::Remark: status_user
Checking in changes prior to tagging of version v1.2.0.

Changelog diff is:

diff --git a/Changes b/Changes
index a0a26d5..6e08949 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,22 @@ Revision history for Uc-Model-Twitter

 {{$NEXT}}

+v1.2.0 2014-02-08T12:44:53Z
+
+    - bugfix: unexpectedly, find_or_create_status remarks RT
+              if RT's original tweet is already favorited/reteeted
+
+    - updated schema: SQL files for migration are in ./migrate
+        - status: added index (user_id, created_at)
+                  and year 2014 partitions
+        - remark: added column status_user_id
+
+    - added relationship methods:
+        - Row::Status: remarked, favorited, retweeted
+        - Row::User: remarks, favorites, retweets,
+                     remarked, favorited, retweeted
+        - Row::Remark: status_user
+
 v1.1.2 2014-02-08T02:45:14Z

     - bug fix: find_or_create_status with $attr->{user_id} doesn't work