Namespace commands to prevent library collisions

[trydionel]

Given that the command names included here are so general, I'd like to namespace all of them behind a 'pivotal' catchall; e.g.,

git feature => git pivotal feature

Munshkr has a starting solution coded in his fork, and I've been exploring the git-style-binaries gem as well. It might be nice to also toss in a method which builds git aliases to allow the original invocation as well.

[leckylao]

👍
Or gitpivotal, git-pivotal