Add trust to list of platforms

This change adds ubuntu Trust (14.04) to the list of packaged platform
artifacts.

Author: nebhale

rakelib/package.rb

@@ -32,7 +32,7 @@ def self.version
 
   BUILDPACK_VERSION = JavaBuildpack::BuildpackVersion.new(false).freeze
 
-  PLATFORMS = %w(centos6 lucid mountainlion precise).freeze
+  PLATFORMS = %w(centos6 lucid mountainlion precise trusty).freeze
 
   STAGING_DIR = "#{BUILD_DIR}/staging".freeze