Commiting changes.
Merge branch 'master' of https://github.com/yoavfreund/UCSD_BigData
Adding IOPerformance
Adding notebook collections ioPerformance and boto, updating LaunchNotebookCollection.py: a new command for copying credentials to the instance (not a good idea to put credentials on github).
Updated notebooks on EC2 instance
Update NotebookCollections.md
Update NotebookCollections.md
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