Feature/upgrade to 4.1

Hey All,

This is an upgrade that is targeting [#6](https://github.com/wetap/wetap-api/pull/6), so merge that first.  Then merge this one into master.

This PR upgrades the API to rails version 4.1.1
Basically, it's to get at the new secrets.yml stuff, as well as to keep things fresh and minty. I used the upgrade guide here:
http://guides.rubyonrails.org/upgrading_ruby_on_rails.html#upgrading-from-rails-4-0-to-rails-4-1

One notable (imho) improvement that I did _not_ include is the new way to maintain the freshness of the TEST DB. It is described in this link, see the point about `test_helper.rb`
http://edgeguides.rubyonrails.org/4_1_release_notes.html#railties-notable-changes
At some point soon I'd like to get that in.