#2116 - What is it - chapter - Updated Chapter with peer review comments, Create 3 new subtopics
#2131 - Safecoin - topic - Added safecoins.md, restructed TOC to move safecoin.md to how it works section, edited safecoin.md to remove duplicate data
#2133 - Wallet - topic - Created topic and moved Farmers and Builder to How it works chapter in TOC
#2134 - MaidSafe client - topic - Topic created and TOC updated i What it is chapter