Fixed gate by Updating Gemfile to pin Rake to 10.1.1
Fixed gate by Updating Gemfile to pin Rake to 10.1.1

The latest Rake update requires Ruby >= 1.9. Bundler in the
current gate uses 1.8.x. This update fixes the gate by pinning
Rake to the last known working version.

Change-Id: I857f6638a54160a315d5d98c77357a7f6449f3bd

imcsk8/puppet-ceilometer,matthewfischer/puppet-ceilometer