bump to new relic 3.5.3.25 due to security fix
update vendored new relic to 3.5.3.25
update changelog to 3.5.3.25
fix json marshalling with old ActiveSupport (2.x)

** [NewRelic][12/11/12 14:31:21 -0800
117d4803-159e-40a5-8c9d-d0a9098f2ba2 (3)] ERROR : Error establishing
connection with New Relic Service at collector.newrelic.com:80: wrong
number of arguments (2 for 1)
** [NewRelic][12/11/12 14:31:21 -0800
117d4803-159e-40a5-8c9d-d0a9098f2ba2 (3)] ERROR :
/app/.gems/gems/activesupport-2.3.14/lib/active_support/json/encoders/object.rb:3:in
`to_json'
/usr/ruby1.9.2/lib/ruby/1.9.1/json/common.rb:212:in `generate'
/usr/ruby1.9.2/lib/ruby/1.9.1/json/common.rb:212:in `generate'
/usr/ruby1.9.2/lib/ruby/1.9.1/json/common.rb:336:in `dump'
/app/vendor/plugins/rpm/lib/new_relic/agent/new_relic_service.rb:364:in
`dump'
/app/vendor/plugins/rpm/lib/new_relic/agent/new_relic_service.rb:119:in
`invoke_remote'
/app/vendor/plugins/rpm/lib/new_relic/agent/new_relic_service.rb:44:in
`connect'
/app/vendor/plugins/rpm/lib/new_relic/agent/agent.rb:738:in
`connect_to_server'
/app/vendor/plugins/rpm/lib/new_relic/agent/agent.rb:749:in
`query_server_for_configuration'
/app/vendor/plugins/rpm/lib/new_relic/agent/agent.rb:865:in `connect'
/app/vendor/plugins/rpm/lib/new_relic/agent/agent.rb:580:in `block (2
levels) in deferred_work!'
/app/vendor/plugins/rpm/lib/new_relic/agent.rb:302:in
`disable_all_tracing'
/app/vendor/plugins/rpm/lib/new_relic/agent/agent.rb:575:in `block in
deferred_work!'
/app/vendor/plugins/rpm/lib/new_relic/agent/agent.rb:553:in
`catch_errors'
/app/vendor/plugins/rpm/lib/new_relic/agent/agent.rb:574:in
`deferred_work!'
/app/vendor/plugins/rpm/lib/new_relic/agent/agent.rb:601:in `block in
start_worker_thread'
update changelog for v13
update to 58d22547839aed964cb242f40f67eb8b49dadc17