Simplified common_article_util functions

Simplified common_article_util functions
    application/views/articles/2013_06_cpp_setup.php
    application/views/articles/2013_08_oeis.php
    application/views/common_article_util.php
Implemented 'jotting' functionality

Implemented 'jotting' functionality
    application/controllers/article.php
    application/controllers/jotting.php       (+)
    application/controllers/pages.php
    application/models/jotting_model.php      (+)
    application/views/article_date.php
    application/views/pages/jottings.php      (+)
    application/views/sidebars/sb_jotting.php (+)