[SPARK-5461] [graphx] Add isCheckpointed, getCheckpointedFiles methods to Graph#4253

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jkbradley wants to merge 6 commits intoapache:masterfrom

jkbradley:graphx-checkpoint

Commits on Jan 28, 2015

Commits on Jan 29, 2015

added overrides for isCheckpointed, getCheckpointFile in EdgeRDDImpl, VertexRDDImpl. The corresponding Graph methods now work.
jkbradley
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changed partitionsRDD in EdgeRDDImpl, VertexRDDImpl to be non-transient
jkbradley
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Commits on Feb 2, 2015

In EdgeRDDImple, VertexRDDImpl, added transient back to partitionsRDD, and made isCheckpointed check firstParent instead of partitionsRDD
jkbradley
committed
added class tag to firstParent call in VertexRDDImpl.isCheckpointed, though not needed to compile
jkbradley
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