Review error handling

[weavenet]

@bradly receieved a transient error than did not appear to be handled correctly. We should verify that our error handling logic is sound.

2013-05-21 19:22:21 -0700 INFO : Updating Cloud Formation stack lc-pod-2-e2e-1-worker-2. /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/aws/cloud_formation/error.rb:14:in process': undefined methodresponse' for #Excon::Errors::SocketError:0x007fef7fb74c30 (NoMethodError) from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/aws/cloud_formation.rb:32:in rescue in update' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/aws/cloud_formation.rb:26:inupdate' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/stack/stack_updater.rb:29:in update' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/stack/stack_updater.rb:17:inupdate_stack_if_parameters_changed' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/stack.rb:53:in update' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/cli/deploy.rb:74:inblock (2 levels) in deploy' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/cli/shared.rb:43:in rescue_exceptions_and_exit' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/cli/deploy.rb:73:inblock in deploy' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/cli/deploy.rb:62:in each' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/cli/deploy.rb:62:indeploy' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/lib/simple_deploy/cli.rb:39:in start' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/gems/simple_deploy-0.7.3/bin/simple_deploy:6:in<top (required)>' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/bin/simple_deploy:19:in load' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/bin/simple_deploy:19:in

' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/bin/ruby_noexec_wrapper:14:in eval' from /Users/bfeeley/.rvm/gems/ruby-1.9.3-p385@lc/bin/ruby_noexec_wrapper:14:in

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