Removed version requirements from Gemfile.
Added pages for main vroom callbacks (init, display, etc).
Kramdown is now the default markdown engine.
Added vagrant directory to .gitignore.
Explicitly disable lighting in example code.
Changed http_prefix and configured github pages deployment.
Added Vagrantfile and salt states for middleman development.
Updated .gitignore file.
Added scripts for generating example images.
Merge branch 'development'

Conflicts:
	Gemfile.lock
Changed default box to trusty (64-bit).
Removed rvm (default ruby version is 1.9.3).
Removed rvm-specific options from middleman and bundler.
Removed rvm requirement from init-app and fixed typo in start-app.