Added Scala and Python examples for mllib
Commented the last part of collaborative filtering examples that lead to errors
Added table of contents and minor fixes
Added proper evaluation example for collaborative filtering and fixed typo
Fixed merge conflict
Update README.md

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Merge pull request #355 from ScrapCodes/patch-1

Update README.md

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Merge pull request #322 from falaki/MLLibDocumentationImprovement

SPARK-1009 Updated MLlib docs to show how to use it in Python

In addition added detailed examples for regression, clustering and recommendation algorithms in a separate Scala section. Fixed a few minor issues with existing documentation.