Update license to Apache 2.0; previous 'all rights reserved' was unintentional / an oversight.

metadata.rb

 maintainer       "Brightcove, Inc"
 maintainer_email "masterchefs@brightcove.com"
-license          "All rights reserved"
+license          "Apache 2.0"
 description      "Installs/Configures ulimit"
 long_description IO.read(File.join(File.dirname(__FILE__), 'README.md'))
 version          "0.1.0"