Fix overriding existing symlinks that point to directories.

lib/homesick.rb

@@ -79,6 +79,7 @@ class Homesick < Thor
   end
 
   desc "symlink NAME", "Symlinks all dotfiles from the specified castle"
+  method_option :force, :default => false, :desc => "Overwrite existing conflicting symlinks without prompting."
   def symlink(name)
     check_castle_existance(name, "symlink")
 

lib/homesick/actions.rb

@@ -86,7 +86,7 @@ class Homesick
           say_status :conflict, "#{destination} exists and points to #{destination.readlink}", :red unless options[:quiet]
 
           if options[:force] || shell.file_collision(destination) { source }
-            system "ln -sf #{source} #{destination}" unless options[:pretend]
+            system "ln -nsf #{source} #{destination}" unless options[:pretend]
           end
         end
       elsif destination.exist?