update appriasal tasks setup and link to github repositories for rails edge
add rails 4.1 to testing
Merge pull request #1064 from twalpole/travis_failures

Update CI set-up for Rails 4.1 and unreleased Rails edge gems.
fix wrong version of Rails in 4.1 appraisal ref #1064
we might as well deprecate Rails 4.0 with 5 on the way
Deprecate Rails < 4.1
gem updates and mock additions needed to get the tests to pass on edge rails
Merge pull request #1071 from twalpole/rails_edge_errors

gem updates and mock additions needed to get tests running on edge rails