Added ensure param to mysql::ruby.

allows users of the module to specify the 
package version.

Author: Dan Bode

manifests/ruby.pp

@@ -1,5 +1,6 @@
 #installs the ruby bindings for mysql
 class mysql::ruby(
+  $ensure = installed,
   $package_name = $mysql::params::ruby_package_name 
 ) inherits mysql::params {
   # I am not making the mysql package a dep for this
@@ -13,6 +14,6 @@
   #  name => $ruby_mysql_name,
     name => $package_name, 
     provider => 'gem',
-    ensure   => installed,
+    ensure   => $ensure,
   }
 }