Added the Hyperlink-Induced Topic Search (HITS) algorithm in GraphX#4

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rfurman wants to merge 5 commits intorxin:ralphfrom

Commits on Jan 1, 2015

Commits on Jan 6, 2015

Fix up style, and remove caching/materialization.
rfurman
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Commits on Jan 8, 2015

Introduce warm start, also refactor the HITS computation and make it more efficient
rfurman
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Change the HITS unit tests: remove some caches that were unnecessarily introduced
rfurman
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