Minor fixes

Minor fixes
    application/views/articles/2014_08_whylinux.php
    application/views/jottings/2014_09_watermark.php
    css/style.css
Fixed typos

Fixed typos
    application/views/articles/2014_08_whylinux.php
Support for github file ajax loading

Support for github file ajax loading
    githubfile.php   (+)
    javascripts/custom.js