Move all code to share/

To better suit Homebrew and best practices in general, all code that was formerly in lib/ is now in share/. Also, antigen.zsh has been removed from the repo, it's now recommended to use the package-managed version of Antigen with Homer.

Initial release

This is the initial release of Homer. There may be a few bugs and non-working commands, but the general gist of the framework is there. It helps manage your dotfiles and user scripts, and provides an easy way to track your home directory with a Git repo.