Further refine inf-ruby-prompt-pattern to match various RVM prompts.

The new regexp should match the following prompts:

# MRI 1.9.2
ruby-1.9.2-p0 >
RUBY-1.9.2-p0 >
ruby-1.9.2-p0 >>
ruby-1.9.2-p180 :001 >
# jruby
jruby-1.5.2 >
jruby-1.5.2 >>
# MRI 1.8.7
irb(main):001:0>
# Plain
>
>>

rinari.el

@@ -247,7 +247,7 @@ argument allows editing of the console command arguments."
     (run-ruby command)
     (save-excursion
       (set-buffer "*ruby*")
-      (set (make-local-variable 'inf-ruby-prompt-pattern) "^\\([a-zA-Z0-9.\-]+ :[0-9]+ >\\|>>\\) ")
+      (set (make-local-variable 'inf-ruby-prompt-pattern) "^\\(j?ruby[^> ]+\\|J?RUBY[^> ]+\\|irb([^> ]+\\)?\\( ?:[0-9]+\\)* ?>>? ")
       (set (make-local-variable 'inf-ruby-first-prompt-pattern) inf-ruby-prompt-pattern)
       (rinari-launch))))