minor change in index.html for lesson 7
tiny change in development branch
implemented google analytics and social buttons
added Bitcoin-button.
changed sentence on Bitcoin-button to preorder
updated index.html
updated index.html
updated index.html
updated index.html
updated index.html
updated index.html
updated index.html
updated index.html
updated index.html
updated index.html
updated index.html
updated index.html
updated index.html
updated index.html
updated index.html