should not fail build when delete application version failed, log warning is good enough

[xli]

/var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/aws-sdk-1.51.0/lib/aws/core/client.rb:375:in return_or_raise': Unable to delete application version: deploy-pasty-1150-deploy-eb-deploy-web. An operation is already in progress, please retry again shortly. (AWS::ElasticBeanstalk::Errors::OperationInProgressFailure) from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/aws-sdk-1.51.0/lib/aws/core/client.rb:476:inclient_request' from (eval):3:in delete_application_version' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/lib/eb_deployer/aws_driver/beanstalk.rb:68:indelete_application_version' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/lib/eb_deployer/throttling_handling.rb:13:in block in method_missing' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/lib/eb_deployer/utils.rb:13:inbackoff' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/lib/eb_deployer/throttling_handling.rb:12:in method_missing' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/lib/eb_deployer/application.rb:69:inblock in remove' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/lib/eb_deployer/application.rb:66:in each' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/lib/eb_deployer/application.rb:66:inremove' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/lib/eb_deployer/version_cleaner.rb:11:in clean' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/lib/eb_deployer/application.rb:77:inclean_versions' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/lib/eb_deployer.rb:213:in deploy' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/lib/eb_deployer.rb:255:incli' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/gems/eb_deployer-0.4.8/bin/eb_deploy:11:in <top (required)>' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/bin/eb_deploy:23:inload' from /var/go/.rbenv/versions/1.9.3-p484/gemsets/mingle-saas/bin/eb_deploy:23:in `

'

[xli]

fixed by fbccd0c86f16ebf974e55d61ff64400e8656957a, published version 0.4.9