Dotfiles with portable installer

Added

• Dotfiles for:
  • Emacs
  • Git
  • Mercurial hg
  • Wget
  • Oh My ZSH! with aliases and theme
  • Screen
  • Midnight Commander mc
  • htop
• Scripts for:
  • installing the dotfiles repository along with the packages the dotfiles
    are meant for
  • updating the whole system
• Other:
  • list of mostly useful packages
  • license, readme and this changelog