binstubs from spring
Add bootstrap-sass gem
Fix /script/rails for Rails 4. Scripts rails, bundle, rake for Rails 4 are in /bin
Add an ImagesController (AssetsController with routes named 'assets' clashes with Rails' asset pipeline routes) to serve an index file an a random image up.
Use Bootstrap Carousel to alternate between two images, each of which hits the random action which loads a new random image from the list of available Assets.
Remove placeholder menus, etc. from layout, fix path for favicon
Rig up a "negative" bootstrap theme, largely by inverting all the colors. Photos look better on a black background.

Next/Todo:
* Control the randomness, e.g. let the user choose from with the tag tree, e.g. photos (random or sequential) from a specific year or season, etc.
* Add a menu bar that softly fades into view on mouseover, otherwise fades away to transparency.
* Vertically center images if they're too small to fill the screen.

Conflicts:
	Gemfile.lock
	app/models/exif_asset.rb
	bin/rails
	bin/rake
migrate for Travis