Copied a bunch of examples from Titan.

examples/error/.gitignore

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+bundle/
+.bundle/

examples/error/Dockerfile

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+FROM iron/ruby:dev
+
+WORKDIR /worker
+ADD Gemfile* /worker/
+RUN bundle install
+
+ADD . /worker/
+
+ENTRYPOINT ["ruby", "error.rb"]

examples/error/Gemfile

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+source 'https://rubygems.org'
+
+gem 'json', '> 1.8.2'
+gem 'iron_worker', '>= 3.0.0'

examples/error/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    iron_core (1.0.9)
+      rest (>= 3.0.4)
+    iron_worker (3.2.2)
+      iron_core (>= 0.5.1)
+      json (> 1.8.1)
+      rest (>= 3.0.6)
+    json (1.8.3)
+    net-http-persistent (2.9.4)
+    netrc (0.11.0)
+    rest (3.0.6)
+      net-http-persistent (>= 2.9.1)
+      netrc
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  iron_worker (>= 3.0.0)
+  json (> 1.8.2)
+
+BUNDLED WITH
+   1.10.5

examples/error/README.md

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+This is a worker that errors out (ie: exits with non-zero exit code).
+
+
+## Building Image
+
+```
+docker build -t iron/error .
+docker run -e 'PAYLOAD={"input": "yoooo"}' iron/error
+```

examples/error/error.rb

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+require 'iron_worker'
+
+if ENV['PAYLOAD'] && ENV['PAYLOAD'] != ""
+    payload = JSON.parse(ENV['PAYLOAD'])
+    puts payload['input']
+end
+
+raise "Something went terribly wrong!"