Bump version to 1.5.2
Bump version to 1.5.2

iron-io/iron_worker_ruby_ng,iron-io/iron_worker_ruby_ng,iron-io/iron_worker_ruby_ng,iron-io/iron_worker_ruby_ng,iron-io/iron_worker_ruby_ng,iron-io/iron_worker_ruby_ng,iron-io/iron_worker_ruby_ng