Set up AUG member page
#add the following columns to the users table: title, institution, webpage, research summary
1. Removed title/webpage/institution from User model and added a boolean flag to mark AUG members
2. Reduced the aug function in the welcomes controller and added a test for it;
Merge branch 'aug_info' of https://github.com/licongcui/www.sleepdata.org into licongcui-aug_info
Added Academic User Group page and added research summary for AUG Members