fix testcase on locale change
replace scope with callable object

- in order to prepare for rails4 migration
Merge pull request #287 from szetobo/fix_test_case

fix testcase on locale change
Merge pull request #288 from szetobo/update_scope

replace scope with callable object
vendor ajax-chosen assets.
remove ajax-chosen gem dependency
not loading chosen-rails gems.
support recent psych.
use plain old ransack.