Updated list of EC2 instance types.

Fixes #196
https://bugzilla.redhat.com/show_bug.cgi?id=1120836
https://bugzilla.redhat.com/show_bug.cgi?id=1120841

@jrafanie or @gmcculloug Please review.

This PR only fixes the issue at hand.  Will create new issues around the rest of the problems:
- EMS Refresh should not blow up when a new instance type comes out and we don't recognize it.  It should just gracefully shrug its shoulders and move on.
- Need to deal with the paravirtual vs hvm virtualization types for provisioning.  We'll need a new column on images to know what type of image it is, and probably a supports_paravirtual? and supports_hvm? columns on the flavor.  Then, depending on the image chosen for EC2, only show flavors supported.  I've added the data in this PR, so at least the "backend" has it available.