updating the location of the ceedling rakefile (now in the ceedling dir)

This removes all the ceedling library files from the $LOAD_PATH, which could cause collision issues. 

As part of this update, this will force a new API version update due to the user created plugins that require any files from within Ceedling. I.E. require 'plugin', require 'constants' now would be require 'ceedling/plugin' and require 'ceedling/constants'.