[19/21] SAMZA-7: Rewrite Container section of docs to bring it up-to-date. Reviewed by Jakob Homan.

[martinkl]

http://git-wip-us.apache.org/repos/asf/incubator-samza/blob/26c1e27d/docs/img/0.7.0/learn/documentation/container/metrics.png
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http://git-wip-us.apache.org/repos/asf/incubator-samza/blob/26c1e27d/docs/img/0.7.0/learn/documentation/container/tasks-and-partitions.png
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