Allow sort by a field, and not use in search.
Accepts sort column only if it's a ransortable_attribute.

accepts sort column only if it's a ransortable_attribute.
Only ransackable_attributes are valid for search. Fix spec and add one
to test search valid attributes. Remove unused formatter from schema.rb.
Add auth_object support to attribute & sort nodes when call
ransackable_attributes or ransortable_attributes.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	spec/ransack/adapters/active_record/base_spec.rb
Fix mysql tests. Move sort, search & admin fields from ransacker to DB.
change collating sequence to fix mysql search issue.
Merge remote-tracking branch 'upstream/master'
run backslash test
Fix mysql issue on Rails 3.0
Merge remote-tracking branch 'upstream/master'

Conflicts:
	spec/spec_helper.rb
Merge pull request #294 from Alejandro963/master

Fix bug using separate white lists (search & sort)