Fix whitespace
Regenerate Capfile for Rails 4

Regenerate Capfile using latest Capistrano (v2.15.5).
Resolve encoding error affecting deployments

Prior to this commit, I was getting the following error when running
`cap deploy`:

> ArgumentError: invalid byte sequence in US-ASCII
> An error occurred while installing mongoid-paranoia (0.1), and Bundler cannot
> continue.
> Make sure that `gem install mongoid-paranoia -v '0.1'` succeeds before bundling.

Credit to @ruckus for suggesting this fix [1]. :sparkles:

[1]: http://ruckus.tumblr.com/post/18613786601/bundler-install-error-argumenterror-invalid-byte
Teach config.assets.precompile about plugin images

Ensure that images in Stratify plugins are precompiled for production.