update readme

README.rdoc

@@ -8,17 +8,29 @@ easy to build custom shells (i.e. for a gem or application) and complex shells (
 
 == Install
 
-Install the gem with:
+If you have {readline}[http://cnswww.cns.cwru.edu/php/chet/readline/rltop.html], install ripl with:
 
-    sudo gem install ripl
+    gem install ripl
 
-To make your first ripl experience smoother, also install these plugins:
+If you don't have readline, first install ripl with {a pure ruby
+readline}[https://github.com/luislavena/rb-readline]:
+
+    gem install ripl rb-readline -- --without-readline
+
+Then, add the following to ~/.riplrc:
+
+    Ripl.config[:readline] = 'rb-readline'
+    Ripl.config[:completion] = {:readline => :ruby }
+
+== Setup
+
+To make your first ripl experience smoother, install these plugins:
 
     # Adds multi-line evaluation
-    sudo gem install ripl-multi_line
+    gem install ripl-multi_line
 
     # Ignore errors caused by irb-specific configuration in ~/.irbrc
-    sudo gem install ripl-irb
+    gem install ripl-irb
 
     # Add to ~/.riplrc
     require 'ripl/multi_line'
@@ -161,6 +173,8 @@ see {ripl-rails}[http://github.com/cldwalker/ripl-rails].
 * {ripl-profiles}[https://github.com/janlelis/ripl-profiles]: load ripl profiles with a --profile option
 * {ripl-short_errors}[https://github.com/janlelis/ripl-misc/blob/master/lib/ripl/short_errors.rb]:
   display short backtrace
+* {ripl-rocket}[https://github.com/janlelis/ripl-rocket]: outputs ripl result as a hash rocket
+* {ripl-padrino}[https://github.com/achiu/ripl-padrino]: console for padrino
 
 == Ripl Shells
 Shells built on top of ripl: