Update gem summary / description

Author: obrie

Rakefile

@@ -8,6 +8,7 @@ spec = Gem::Specification.new do |s|
   s.version           = '0.4.1'
   s.platform          = Gem::Platform::RUBY
   s.summary           = 'Adds support for declaring an ActiveRecord class as an enumeration'
+  s.description       = s.summary
 
   s.files             = FileList['{lib,test}/**/*'] + %w(CHANGELOG.rdoc init.rb LICENSE Rakefile README.rdoc) - FileList['test/app_root/{log,log/*,script,script/*}']
   s.require_path      = 'lib'