Added meaintenance placeholder page

Added meaintenance placeholder page.

    .gitftpignore
    maintenance/background.png        (+)
    maintenance/background_repeat.png (+)
    maintenance/base.css              (+)
    maintenance/down-page.html        (+)
    maintenance/layout.css            (+)
    maintenance/skeleton.css          (+)
    maintenance/style.css             (+)
    maintenance/swl_logo_sm_light.png (+)
Fixed some code tag issues on earlier article

Fixed some code tag issues on earlier article
    application/views/articles/2013_06_cpp_setup.php
    application/views/common_article_util.php
    css/style.css
Added article: 'Mapping the OEIS Database'

Added article: 'Mapping the OEIS Database'
    application/models/article_model.php
    application/views/articles/2013_08_oeis.php                    (+)
    images/articles/2013_08_oeis/color2_ramp_598.png               (+)
    images/articles/2013_08_oeis/oeis.ff.png                       (+)
    images/articles/2013_08_oeis/oeis.opt.gif                      (+)
    images/articles/2013_08_oeis/oeis_anom.png                     (+)
    images/articles/2013_08_oeis/oeis_anom_2.png                   (+)
    images/articles/2013_08_oeis/oeis_blender_closeup_600.png      (+)
    images/articles/2013_08_oeis/oeis_blender_closeup_wm.png       (+)
    images/articles/2013_08_oeis/oeis_blender_far2_600.png         (+)
    images/articles/2013_08_oeis/oeis_blender_far2_wm.png          (+)
    images/articles/2013_08_oeis/oeis_frequencymap2_600.png        (+)
    images/articles/2013_08_oeis/oeis_frequencymap2_600crop_wm.png (+)
    images/articles/2013_08_oeis/oeis_frequencymap2_wm.png         (+)
    images/articles/2013_08_oeis/snakepattern2_small.png           (+)