drop ruby 18mode, liberate ActiveSupport
do not check if encoding is a thing
remove obsolete AR components, fixes #1333
Fix the order of paths at require_dependencies.
Merge pull request #1492 from namusyaka/fix-paths-order

Fix the order of paths at require_dependencies. Closes #1491
Merge pull request #1414 from padrino/19mode

drop ruby 18mode, liberate ActiveSupport
bump version to 0.12.0.rc
allow ActiveSupport 3, improves #1414