Rakefile: install config/* to ~/.config. Refactoring.
Rakefile: install config/* to ~/.config. Refactoring.

- Files and dirs below "config" (if present) will get installed into
  ~/.config. This is easily expandable for other "in between" dirs.

- Make sure that ENV[HOME] is not empty.

- Remove ".erb" only at the end of files.

scorpiovn/dotfiles,scorpiovn/dotfiles,scorpiovn/dotfiles,blueyed/dotfiles,blueyed/dotfiles,scorpiovn/dotfiles,blueyed/dotfiles,blueyed/dotfiles,scorpiovn/dotfiles,blueyed/dotfiles