[COOK-3551] Allow user to set up a trusted APT repository

Signed-off-by: Seth Vargo <sethvargo@gmail.com>
Update whitespace and copyrights
Update README formatting
Version bump to v2.1.2
Version bump to v2.1.3
Allow user to bypass apt cache via attributes

 * User should add attribute ['apt']['cache_bypass']
 * Value should be an array, where each key is a server and value is protocol, eg:
     "download.oracle.com":"http"