Bunch of changes

* modified the returning structure of get_all_feed_user_items
* modified query used in querying items
* modified frontend js accordingly
* fix on subscribing to new feed return feed
* fix adding duplicate items by add hashed guid viz. a unique key and
* insert ignore statement
* UK added to user_feeds.user_id & feed_id, to prevent same user subscribing to same feed
* index.html remove local jquery use cdn
* added bash script to take mysqldump_id