Merge pull request #105 from geigerzaehler/master

Status command lists applications across all terminals
Replace "spring [console|runner|generate]" with "spring rails"

Closes #76
Rename "spring test" to "spring testunit".

It's longer but it doesn't conflict with the bash builtin "test"
command.

The recommended way to run spring is via binstubs, so people can just
type "bin/testu<Tab>" anyway.

Also, rails 4 will have a "rails test" command that will be integrated
into spring too.

Fixes #64.
Add link to direnv
Add a changelog
bump version