Install rake < 11.0.0 for ruby < 1.9.3

[atrepca]

Starting with version 11.0.0 rake requires ruby 1.9.3 or later, see ruby/rake@4ab6eba. This is causing Travis tests to fail, see the Ruby: 1.8.7 builds for #486:

Gem::InstallError: rake requires Ruby version >= 1.9.3.
An error occurred while installing rake (11.0.1), and Bundler cannot continue.

[jlambert121]

I think rake 11.0 breaks when beaker is installed as well, might need to pin this as <11.0.0 regardless of ruby version.

[atrepca]

beaker-rspec is in the system_tests group and bundle is skipping that, Travis is running bundle install --without system_tests development, and all builds are green here. I can amend the commit if you still think it's necessary.

[jlambert121]

Yeah, please do. It breaks local tests if you have the beaker gem installed.

[atrepca]

@jlambert121, done.

[jlambert121]

Thanks - and thanks for squashing into a single commit.

[jlambert121]

Reverting as Rake replaced the method as deprecated