[HACK-3252] add create/delete disk functions

This pull requests resolves Issue #20 

Creates two new functions:
Hardware.addDisk(size)
Disk.delete()

 This is a HACKATHON ticket.

https://dataxu.atlassian.net/browse/HACK-3252
So, this adds an 8gig drive? Then you would have to log into the instance and mount it, right?