test against ruby 2.1.4
Merge pull request #30 from devfu/travis

test against ruby 2.1.4
remove active admin

inherited resources will not support rails 4.2
experiment with rails 4.2.0.beta
Merge pull request #31 from devfu/rails-4.2

rails 4.2
install rubocop
configure rubocop for Dev Fu! style
fix rubocop errors
add rubocop-rspec
configure rubocop-rspec
fix rubocop-rspec errors
add rubocop rake task
run rubocop before specs
install rubocop in development & test environments
don't rubocop vendor/