Use curl --insecure to work with Cygwin's curl.

Rakefile

@@ -198,10 +198,10 @@ vim_plugin_task "janus_themes" do
 end
 
 vim_plugin_task "molokai" do
-  sh "curl https://github.com/mrtazz/molokai.vim/raw/master/colors/molokai.vim > colors/molokai.vim"
+  sh "curl --insecure https://github.com/mrtazz/molokai.vim/raw/master/colors/molokai.vim > colors/molokai.vim"
 end
 vim_plugin_task "mustache" do
-  sh "curl https://github.com/defunkt/mustache/raw/master/contrib/mustache.vim > syntax/mustache.vim"
+  sh "curl --insecure https://github.com/defunkt/mustache/raw/master/contrib/mustache.vim > syntax/mustache.vim"
   File.open(File.expand_path('../ftdetect/mustache.vim', __FILE__), 'w') do |file|
     file << "au BufNewFile,BufRead *.mustache        setf mustache"
   end
@@ -212,7 +212,7 @@ vim_plugin_task "arduino","git://github.com/vim-scripts/Arduino-syntax-file.git"
   end
 end
 vim_plugin_task "vwilight" do
-  sh "curl https://gist.github.com/raw/796172/724c7ca237a7f6b8d857c4ac2991cfe5ffb18087/vwilight.vim > colors/vwilight.vim"
+  sh "curl --insecure https://gist.github.com/raw/796172/724c7ca237a7f6b8d857c4ac2991cfe5ffb18087/vwilight.vim > colors/vwilight.vim"
 end
 
 if File.exists?(janus = File.expand_path("~/.janus.rake"))