Comment out specific gem rack version in our vendored Rails

http://projects.puppetlabs.com/issues/11669
Update VERSION for 1.2.23-rc3

Signed-off-by: Moses Mendoza <moses@puppetlabs.com>
Merge branch '1.2rc'

* 1.2rc:
  Update VERSION for 1.2.23-rc3
  Comment out specific gem rack version in our vendored Rails