[SPARK-3812] [BUILD] Adapt maven build to publish effective pom.#2673

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ScrapCodes wants to merge 4 commits intoapache:masterfrom

ScrapCodes:build-changes-effective-pom

Commits on Oct 20, 2014

Shaded some unused class of an unused dep, to generate effective pom(s)
ScrapCodes
committed

Commits on Oct 21, 2014

Added a useless dependency, so that we can shade it. And realized fake shading works for us.
ScrapCodes
committed
improved comment messages..
ScrapCodes
committed

Commits on Oct 22, 2014

used an unused dep.
ScrapCodes
committed