Adding landing page content from https://docs.google.com/document/d/1aMW...

...e0plrR9A9v0EM64O0lj1O7iTYM3GSLVW2dnYWL0Y/edit#.

Adding landing page content from https://docs.google.com/document/d/1aMWe0plrR9A9v0EM64O0lj1O7iTYM3GSLVW2dnYWL0Y/edit?usp=sharing

Added share buttons from http://www.sharethis.com. 

Updated links. Links are set to open in a new window.