Blog improvements

Added:
 - Save & Publish
FileDB: sort by columns
FileDB improvements

Added:
 - Laravel's paginate support
 - Avg selector
 - Count selector
 - Max selector
 - Min selector
 - Laravel's where_null, where_not_null, where_in, where_not_in,
or_where_in, or_where_null, or_where_not_in, or_where_not_null
selectors support

Improvements:
 - Limit
 - _rawurlencode & _rawurldecode methods now support arrays
 - Delete method now support arrays & selectors before deletion

Removed:
 - add_qrcode method moved to Utitlites class
Spelling fix
Inprovements for QR Code in Posts
New QR Code for posts (/item)
Clean up

Removed all unused images
Added files for image uploader