Updated content and text for Rank the Research
Specified that the drawing was for a gift card
Added more text to home page
More home page updates
Merge branch '3-0-landing-page' into 3-0-stable
Merge branch '3-0-landing-page' into 3-0-stable
Removed placeholder graphs from social page
Updated icons on main navigation menu
Migration from old surveys to new ones
Merge branch '3-0-dev' into 3-0-stable
Added user count to show progress throughout the survey migration task
Version 3.0.0 finalized
Version bump to 3.1.0.pre
Surveys linked on the home page have been updated to better show a member's progress through the available surveys, closes myapnea/www_myapnea_org#167.
Refactored and simplified home page UI a bit

Also removed list of surveys when not logged in as per @krand7's suggestion
Administrators can export users to update MailChimp lists and segments, closes myapnea/www_myapnea_org#158.
Updated text to indicate the prize is a Visa Gift card
Updated the Rank the Research Text on the home page
Year of Birth is now a drop down list to avoid confusion between entering Birth Date instead of Year of Birth, closes myapnea/www_myapnea_org#168.
Added some content links to registration and sign in pages to highlight links better, addresses myapnea/www_myapnea_org#125.