rails 3 activesupport
auto-monkeypatch and bump version
fix ruby versions for test suites
don't install if already installed
update spec helper to work on all rails versions
remove activerecord/activesupport from gem dependencies
project using this gem must supply them
install appraisals gem and create test list
appraisal gemfiles
add 2.1.0 and appraisal to travis script
remove bundle exec