This is especially usefull for applications that mix state files and
configuration files in their dot-directory, for instance :
  - .unison which contains *prf and state files
  - .lftp which contains rc (conf file) and log, cwd_history.

This avoids broken symlinks when manipulating a chroot'ed installation from
the host.

If there is a 'all.host' directory in the repository, dotfiles enables
hosts mode: you now can add a dotfile to a particular host, and any sync
will create symlinks for dotfiles in the 'hostname.host' directory as well
as for the ones in the 'all.host' directory.

Conflicts:
	dotfiles/core.py

Conflicts:
	README.rst
	dotfiles/cli.py
	dotfiles/core.py

Conflicts:
	dotfiles/cli.py
	dotfiles/core.py
	test_dotfiles.py