Added hello example.

examples/hello/.gitignore

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+bundle/
+.bundle/

examples/hello/Dockerfile

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

examples/hello/Gemfile

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

examples/hello/Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    json (1.8.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  json (> 1.8.2)
+
+BUNDLED WITH
+   1.10.5

examples/hello/README.md

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+This is a worker that just echoes the "input" param in the payload.
+
+eg:
+
+This input:
+
+```json
+{
+  "name": "Johnny Utah"
+}
+```
+
+Will output:
+
+```
+Hello Johnny Utah!
+```
+
+## Building Image
+
+```
+# SET BELOW TO YOUR DOCKER HUB USERNAME
+USERNAME=YOUR_DOCKER_HUB_USERNAME
+# build it
+docker build -t $USERNAME/hello .
+# test it
+docker run -e 'PAYLOAD={"name": "Johnny"}' $USERNAME/hello
+# tag it
+docker run --rm -v "$PWD":/app treeder/bump patch
+docker tag $USERNAME/hello:latest $USERNAME/hello:`cat VERSION`
+# push it
+docker push $USERNAME/hello
+```

examples/hello/VERSION

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+0.0.27

examples/hello/hello.rb

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+require 'json'
+
+name = "World"
+
+# payload = STDIN.read 
+# or using env vars: ENV['PAYLOAD']
+payload = ENV['PAYLOAD']
+
+puts 'ARGF: ' + payload.inspect
+if payload != ""
+    payload = JSON.parse(payload)
+    name = payload['name']
+end
+
+puts "Hello #{name}!"