Various minor changes.
Merge branch 'graph' of github.com:rxin/spark into graph

Conflicts:
	graph/src/test/scala/spark/graph/GraphSuite.scala
Adding additional assertions and documenting the edge triplet class
Resurrecting the GraphLab gather-apply-scatter api
Merge branch 'graph' of https://github.com/rxin/spark into graph
More bug fixes
Fixed another bug ..
Added a correctEdges function.
In the process of bringing the GraphLab api back and fixing the analytics toolkit
merged with upstream
Merged graphx from @rxin into master
Merging local changes to @rxin graph branch.
Switching to Long vids instead of integers.  This required a surprising number of changes since the fastutil library function names include the type (e.g., getLong() instead of just get())
Added 2d partitioning
added subgraph
Working on graph test suite
second indexedrdd design
Finished early prototype of IndexedRDD
Adding testing code for indexedrdd
IndexedRDD passes all PairRDD Function tests