Rails 4.1 to get a Spring in its step

A lot of focus lately has been put on improving Rails' speed in dev mode. John Leighton's Spring gem is a result of some of that focus. It preloads your Rails application and keeps it running in the background so you don't need to boot it every time you run a test, rake task, or migration.

As of this commit Spring will be installed by default on newly generated Rails 4.1 apps.

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