Add checkout master after fetching from rep
Add checkout master after fetching from rep

Without checking out a branch, I was consistently getting "fatal: You are on a branch yet to be born" messages from git.
ashfurrow/middleman-gh-pages,cybernetlab/middleman-gh-pages,edgecase/middleman-gh-pages,auscaster/middleman-gh-pages,mattlima/middleman-gh-pages,JohnColvin/middleman-gh-pages,tarebyte/middleman-gh-pages,jagthedrummer/middleman-gh-pages,orta/middleman-gh-pages,kdisneur/middleman-gh-pages,neo/middleman-gh-pages,jrhe/middleman-gh-pages,heirloompixels/middleman-gh-pages,bellycard/middleman-gh-pages,hugomaiavieira/middleman-gh-pages,patilswapnilv/middleman-gh-pages,newcontext/middleman-gh-pages,rmm5t/middleman-gh-pages,baroquebobcat/middleman-gh-pages