[SPARK-5063] More helpful error messages for several invalid operations#3884

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JoshRosen wants to merge 15 commits intoapache:masterfrom

JoshRosen:SPARK-5063

Commits on Jan 3, 2015

[SPARK-5063] Useful error messages for nested RDDs and actions inside of transformations
JoshRosen
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Commits on Jan 4, 2015

Add error message when directly broadcasting RDD.
JoshRosen
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Commits on Jan 6, 2015

Commits on Jan 13, 2015

IllegalStateException fix
JoshRosen
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Commits on Jan 21, 2015

Remove assertNotStopped() calls for methods that were sometimes safe to call on stopped SC's in Spark 1.2
JoshRosen
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Revert two unintentional formatting changes
JoshRosen
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Fix test to reflect 1.2.1 compatibility
JoshRosen
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Commits on Jan 23, 2015

Convert two exceptions into warnings in order to avoid breaking user programs in some edge-cases.
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Commits on Jan 24, 2015

Fix spelling typo
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