Update ReadMe.md so Bower noobs avoid setup errors

Inuit fans who lack Bower experience (hand raised!) may benefit from a little more info about getting Bower installed before they run the <code>$ bower install --save inuit-starter-kit</code> instruction. For instance, I didn't know I had to do a <code>$ bower init</code> first, and thus got various complaints. Since I'm (at least initially) only using Bower to get at the latest and greatest InuitCSS (Yay!), little tips like that would make for a better experience. Word it any way you like, but something like this would certainly have helped *me*.