ASGARD-1108 Add support for cr1.8xlarge

ASGARD-1108 Add support for cr1.8xlarge

To do this, also allow instance types that are only in config, or only
in enum, whether or not they are in HTML/JSON hardware/pricing files.

Mark a method deprecated that is probably unused and is dangerous
because some instance types will not be present in the enum.

Display pricing with only two decimal places of precision, to get rid
of all the errant three-decimal place prices with a dumb trailing zero.

Adjust the instance types list layout to fit the wordy storage
description.