Add a new command for listing branches

[diogocavilha]

Add command to list all branches along with useful info, like when it was created and who created that branch.

Command:

git branch --sort=-committerdate --format='%(HEAD) %(color:green)%(committerdate:relative)%(color:reset) %(color:blue)%(authorname)%(color:reset) %(color:yellow)%(refname:short)%(color:reset) %(contents:subject)'