Restoring elasticsearch-marvel "module" under common git repo

elasticsearch-marvel/Dockerfile

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+FROM dockerfile/elasticsearch
+
+MAINTAINER itzg
+
+RUN /elasticsearch/bin/plugin -i elasticsearch/marvel/latest

elasticsearch-marvel/README.md

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+This image extends the official elasticsearch image by adding the Marvel Sense plugin. This will get you a system ready to use with the [ElasticSearch Getting Started Guide](http://www.elasticsearch.org/guide/en/elasticsearch/guide/current).