prototyping status updates to host information in database.
Remove serial from migration, duplicate of identifier column in table host_statuses
Add field 'dstudio-host-ard-ignore-empty-fields' which is set on per computer basis to ignore computer info fields.
Change PlistModel#to_hash to make testable with FakeFS.
Fix RSpec for computer interface test to match fixture.
Add fixture for POSTing computer status
Fix Rakefile to use ActiveRecord rake tasks.
Note about computers not respecting number series for new computers.