update to appraisal 1.0.0.beta3
add gemfile specifically for Rails 4.0.4
Set I18n.enforce_available_locales = false:

* Avoids deprecation warnings in specs for Rails <= 4.0.3
* Avoids spec errors in Rails 4.0.4
add Rails 4.0.4 to the Travis build matrix
specify a version of Rake compatible with REE and 1.8.7
Merge pull request #1011 from justinfrench/modernize-ci

Modernize our CI stack a bit