Rails 3.1.x has code which checks which version of ruby is being run,
and based on the result, selects a version of turn.
For 1.9.3+, it selects "~> 0.8.3"; for everything else, it selects "0.8.2".
If we remove turn from the Appraisals, but have travis install both versions
that rails might potentially need, the in-generated-app Gemfile building should
work correctly.
Previously, the railties required by the project gemspec was in conflict with
the rails versions being pulled in by Appraisal.
There were situations where a newer rails app was generated by `rails new...`
even though the Appraisal gemfiles/ value should have been setting it correctly.
We need to be able to use the versions of things specified in the appraisal gemfiles/
specify the version of rails for the initial generation of the applications,
but subsequently allow those applications to point to the `Gemfile` within
the newly generated rails apps, rather than wherever BUNDLE_GEMFILE was previously
set by Appraisal.
This allows us to test factory_girl_rails against each minor release of
Rails 3. To run the full suite, run
$ bundle exec rake
To view all the rake tasks Appraisal provides, run
$ bundle exec rake -T appraisal
