updating online optimization
update notebook
Updated the directions for doing and reviewing HW.
added docs to NotebookCollections.md
Adding several files.
Updated launch notebook to allow for explicit directory
adding to launch_notebook.py the ability to launch at an arbitrary directory
Direct launching now working
Cleaning up the notebooks directory
Some changes to the online notebook.
Delete AWSCredentials.py
 updating Launcher
Merge branch 'master' of https://github.com/yoavfreund/UCSD_BigData
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