Revert "Moved to Fog::Core"

This reverts commit 44dacc062d.

See fog/fog#3302 for details of problems

lib/fog/bin/cloudstack.rb

@@ -0,0 +1,28 @@
+class Cloudstack < Fog::Bin
+  class << self
+    def class_for(key)
+      case key
+      when :compute
+        Fog::Compute::Cloudstack
+      else
+        raise ArgumentError, "Unrecognized service: #{key}"
+      end
+    end
+
+    def [](service)
+      @@connections ||= Hash.new do |hash, key|
+        hash[key] = case key
+        when :compute
+          Fog::Compute.new(:provider => 'Cloudstack')
+        else
+          raise ArgumentError, "Unrecognized service: #{key.inspect}"
+        end
+      end
+      @@connections[service]
+    end
+
+    def services
+      Fog::Cloudstack.services
+    end
+  end
+end