Need to split out the dependancies in Travis based on what Ruby version is utilised
Gem::InstallError: rack requires Ruby version >= 2.2.2.
Installing ffi 1.9.18
An error occurred while installing rack (2.0.1), and Bundler cannot continue.
Make sure that `gem install rack -v '2.0.1'` succeeds before bundling.
I have change the Travis.yml to be the same as middleman core - and tests are passing as expected now. But it means we are not testing against older versions of Ruby - make a note of this in the ReadME
Seems Travis : https://travis-ci.org/middleman/middleman-blog is baulking at the ruby versions and some dependancies installed
Need to split out the dependancies in Travis based on what Ruby version is utilised