Upgrade to Rails 4.1

A minimal upgrade to Rails 4.1, leaving rspec at 2.14.1.  

Website opens when started with foreman, and all specs pass.  This is branched from 'atomic', which should be merged first.

Notes:
- configuration files updated to match content of freshly generated Rails 4.1.4 project
- sprockets needed to be downgraded to 2.11.0 in Gemfile.lock to avoid a conflict.
- some dependencies needed to be revised in the spec_helper files