Knocking out some low hanging fruit on the user_guide. This change fixes
the smilies zip file download that was once on the codeigniter.com
domain and has since been moved to the EllisLabs domain.

Signed-off-by: Steven Crothers <steven.crothers@gmail.com>
Merge branch 'develop' of https://github.com/stevencrothers/CodeIgniter into develop