Rename to _capistrano (completion only)

plugins/capistrano/capistrano.plugin.zsh → plugins/capistrano/_capistrano

-function _cap_does_task_list_need_generating () {
+#compdef cap
+#autoload
+
+_cap_does_task_list_need_generating () {
   if [ ! -f .cap_tasks~ ]; then return 0;
   else
     accurate=$(stat -f%m .cap_tasks~)
@@ -7,14 +10,10 @@ function _cap_does_task_list_need_generating () {
   fi
 }
 
-function _cap () {
-  if [ -f config/deploy.rb ]; then
+if [ -f config/deploy.rb ]; then
   if _cap_does_task_list_need_generating; then
     echo "\nGenerating .cap_tasks~..." > /dev/stderr
     cap --tasks | grep '#' | cut -d " " -f 2 > .cap_tasks~
   fi
   compadd `cat .cap_tasks~`
-  fi
-}
-
-compdef _cap cap
+fi