Added base shell for watermark article.

Added base shell for watermark article.
To be merged in master when finished.
    application/models/common_model.php
    application/views/jottings/2013_08_watermark.php   (+)
Using CC-Zero license.

Using CC-Zero license.
    application/views/jottings/2013_08_watermark.php
    application/views/sidebars/sb_jotting.php