Add Wellesley College news announcement and frontpage changes

lms/static/images/press/releases/mass_seal_240x180.png

lms/static/images/press/releases/wellesley-seal_240x180.png

.../images/university/wellesley/wellesley-cover_2025x550.jpg

...images/university/wellesley/wellesley-rollover_160x90.png

lms/static/images/university/wellesley/wellesley.png

lms/templates/feed.rss

lms/templates/index.html

lms/templates/static_templates/faq.html

...templates/press_releases/Wellesley_College_joins_edX.html

lms/templates/university_profile/wellesleyx.html

lms/urls.py