move to jeweler 1.4 and automatic gemspec generation

Author: Christopher Brown

chef-solr/Rakefile

@@ -19,7 +19,7 @@ begin
   end
 
 rescue LoadError
-  puts "Jeweler (or a dependency) not available. Install it with: sudo gem install jeweler"
+  puts "Jeweler (or a dependency) not available. Install it with: sudo gem install gemcutter jeweler (installs jeweler from gemcutter)"  
 end
 
 require 'spec/rake/spectask'