Moved dotless to Homebrew-Alt.

This was the only formula in core that depended on Mono.
Moving to Homebrew-Alt; once brew-tap lands someone could start
a Homebrew-mono repository if they were so inclined.

Formula/dotless.rb

@@ -1,25 +0,0 @@
-require 'formula'
-
-class Dotless < Formula
-  homepage "http://www.dotlesscss.org/"
-  url "https://github.com/downloads/dotless/dotless/dotless-v1.2.1.0.zip"
-  md5 "dd06170b2e6a8f943f715977cfcd254d"
-
-  def install
-    mono_path = which 'mono'
-    unless mono_path
-      opoo "mono not found in path"
-      puts "You need to install Mono to run this software:"
-      puts "http://www.go-mono.com/mono-downloads/download.html"
-      exit 1
-    end
-
-    (bin+'dotless').write <<-EOF.undent
-      #!/bin/bash
-      exec "#{mono_path}" "#{libexec}/dotless.Compiler.exe" "$@"
-    EOF
-
-    libexec.install Dir['*.exe']
-    (share+'dotless').install Dir['*.txt']
-  end
-end