Add extended zshrc

Better config for Zsh. Mainly:

- Improved option settings for changing directores, completion and
  expansion, history, etc.
- Some useful aptitude aliases
- Better completion for kill command
- Add colors to man pages
- Revamped prompt (show current directory, jobs, exit status, and git
  branch and status)
Add colordiff package

Nice coloring of diff output.
Add cdargs and ranger packages

To easily navigate directories.
Fix git installation

Don't use the git-all package, because it installs as dependency the
gitweb package which in turn install apache2!
Small puppet class rename on default manifest

Rename the 'network' class to 'common', since it will be used for a few
more common settings.
Fix owner of user provided directories and files
Add initial clara_manager script to run Clara

Start Clara as a background process.
clara_manager: stop Clara instances at exit