[FLOC-983] Aws deployment documentation

Here's a sketch.

I managed to upgrade the kernel on an amazon EC2 Fedora20 machine.

Trouble is that upgrading the kernel, means that you then can't install the standard ZFS.

So you have to install the clusterhq zfs packages.

Stacked on top of #967. Merge that branch first.
Given this is a pre-requisite to above, it should perhaps come first? "You can use AWS [or other stuff later], once you've done that continue below with the generic Fedora 20 setup instructions."