Fix CSS to give more space for action text and dedicated space for books.
Tweak CSS to allow action area to finite size, infinite length and scrollable.
refactor partials for show.html.slim; fix broken tests.
Add header/footer to basic layout; add sign-out function; update welcome page with helper-generated options.
Attempt to add Bootstrap styling to layout.
Attempt to tweak Bootstrap
Update Gemfile.lock for Heroku
Add precompiled assets for Heroku to see if it allows clean deployment
remove hardcoded 'games/1' from slim and add @id to game#show
Fix broken welcome page and associated tests
Revert "Add precompiled assets for Heroku to see if it allows clean deployment"

This reverts commit a93f2f5e1bd216d5579366f929a9af4d4bf33519.
Merge branch 'master' into wip/css-tweaks
Add CSS improvements.