Add tab completion and fancy prompt to Git

[bittner]

Would you be interested to have two additional features added to the Git class?

• tab completion (based on bash-completion, which activates git-completion.bash if I'm not mistaken)
• Git prompt (based on bash-git-prompt)

Using this could look like this:

  class { 'software::vcsscm::git':
    ensure          => present,
    bash_completion => true,
    bash_prompt     => true,
    gui             => true,
  }

bash_* because: it really just relates to Bash, and would be difficult to generically implement this for several shells (in an "autodetect shell" way).

If you think that would be a good addition, I would open a PR for that. Though, I would (have to) limit my contribution to a Debian/Ubuntu implementation. No Mac, no Windows, for now.

[edestecd]

Yes, I was actually going to add the tab completion myself for osx soon. As long as its optional, i'm not against any new feature.

[edestecd]

The example you have looks good to me