Merge pull request #2 from ChengLu/master

fixed postUrl
Base modifications of _config.yml
Add .gitignore and customize Logistic section
Customize About and Statistics
Customize Main Page sections
Customize venue section at main page
Customize Sponsors
Customize navigation
Customize Team
Customize colors, change blue to purple
Customize hero(title section at main page) background
Customize Subscribe background for main page
Minor customize colors at main page again
Customize statistic pic at main page
Customize footer
One more fixes of config and meta data
Fix MailChimp
Customize Become Sponsor button behaviour
Custmoze cod
Change event date to Nov 1-2