[SPARK-2321] Stable pull-based progress / status API#2696

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JoshRosen wants to merge 19 commits intoapache:masterfrom

JoshRosen:progress-reporting-api

Commits on Oct 7, 2014

Create UI listeners in SparkContext instead of in Tabs:
JoshRosen
committed
Add jobId->stage, stageId->stage mappings in JobProgressListener
JoshRosen
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Begin to sketch the interfaces for a stable, public status API.
JoshRosen
committed

Commits on Oct 8, 2014

Remove getter-style names and "consistent snapshot" semantics:
JoshRosen
committed

Commits on Oct 9, 2014

Commits on Oct 15, 2014

Address several review comments:
JoshRosen
committed

Commits on Oct 24, 2014