add pages controller

Mostly to test whether app will run on Heroku. Without a home page, it
barfs.
Merge branch 'master' of heroku.com:blooming-waters-1570

Conflicts:
	app/views/pages/show.html.haml

Obviously, I'm doing something wrong, since I'm getting merge conflicts
even though I'm working on this alone and I'm only pushing local commits
to remote repositories. Oh well.
configure RSpec and Guard