load action_view for tests if we're on rails 4.1.
AR::Relation#scoped has been removed in favor of #scope, which works on both AR 4.0 and 4.1.
assert_nothing_raised has been removed from minitest 5, which Rails 4.1 depends on.
can't install rails 4.1 with this, because rails 4.1 relies on minitest >= 5, but rubysl-test-unit relies on minitest ~> 4.7. tests pass without it.
use appraisal to test both Rails 4.0 and 4.1.
add Travis CI badge to README.
add changelog entry for Rails 4.1 compatibility. [ci skip]
Merge pull request #252 from botandrose/rails4.1

Rails 4.1 compatibility