Update rbenv guide

ruby/ruby-rbenv-install.md

@@ -12,8 +12,8 @@ http://jonathan-jackson.net/rvm-and-rbenv
 
 Download rbenv-installer and place it to your home folder
 ```
-$ sudo yum --enablerepo=rpmforge,epel,remi -y install git gcc make zlib zlib-devel openssl-develL
-$ wget http://gitlab.zigexn.vn/ventura/dev-guide/raw/master/ruby/rbenv-installer
+$ sudo yum --enablerepo=rpmforge,epel,remi -y install git gcc make zlib zlib-devel openssl-devel wget
+$ wget https://raw.githubusercontent.com/fesplugas/rbenv-installer/master/bin/rbenv-installer
 $ sh rbenv-installer
 ```
 Add rbenv environment variables to load at boot time.
@@ -54,5 +54,11 @@ $ ruby -v
 2.1.5
 ```
 
+### Install Bundler
+
+```
+$ gem install bundler
+```
+