Changing parent dir fsync from guarantee to warning (to work on VirtualBox shared folders)
Making the message more specific, adding errno to warning
Printing err string in addition to errno for portability
Explicitly including utils.hpp
Upgrade packages in the AMI

Review 1425 by @mglukhovsky
Add more options to the pytohn stress client and add a simple insert workload

Related to #2236
Review 1420 by @Tryneus
Merge branch 'next' of github.com:rethinkdb/rethinkdb into next
Removed RSI about Ubuntu 10.04.
Removed RSI saying to remove a thing.
Removed buf_ptr::reserved.
Merge branch 'sam_2130' of github.com:rethinkdb/rethinkdb into sam_2130
Merge branch 'next' into sam_2130