fix rvm auto complete, pointing to $rvm_path

plugins/rvm/rvm.plugin.zsh

@@ -2,7 +2,7 @@ alias rubies='rvm list rubies'
 alias gemsets='rvm gemset list'
 
 local ruby18='ruby-1.8.7-p334'
-local ruby19='ruby-1.9.2-p180'
+local ruby19='ruby-1.9.3-p194'
 
 function rb18 {
 	if [ -z "$1" ]; then
@@ -42,3 +42,8 @@ function gems {
 		-Ee "s/$current_ruby@global/$fg[yellow]&$reset_color/g" \
 		-Ee "s/$current_ruby$current_gemset$/$fg[green]&$reset_color/g"
 }
+
+function _rvm_completion {
+  source $rvm_path"/scripts/zsh/Completion/_rvm"
+}
+compdef _rvm_completion rvm