use newer nokogiri when on newer Rubies
copy mock and gem patches for Rails edge (5) from d488bb1
ammeter 1.1.2 adds Ruby 187 support back in
add rails 4.1 to testing
exclude Ruby < 1.9.3 from Rails 4.1 builds
add Rails 4.2.0.beta1 to build for 2.3-stable
Revert "add Rails 4.2.0.beta1 to build for 2.3-stable"

This reverts commit c540fedf41351c831084bcc14ca6b8bd08e6c96a.
Merge pull request #1074 from justinfrench/switch-nokogiri-for-ruby-193

Rails edge (5) and Formtastic 2.3.x fixes