Warranty Fix, Updated Rails, & OS Version Array

3 commits:

1. A fix for bug [#167](https://github.com/jnraine/munkiserver/issues/167). Several fields were removed as the data on the scrape page is no longer available.

2. Updated Rails to 3.2.12 and removed the newrelic gem as it appears to require a license.

3. Updated the OS Version Array in the packages model to include 10.8.4.