paper_trail 2.6.4

2.6.4

#181/#182 - Controller metadata methods should only be evaluated when paper_trail_enabled_for_controller == true.
#177/#178 - Factored out version_key into it's own method to prevent ConnectionNotEstablished error from getting thrown in instances where has_paper_trail is declared on class prior to ActiveRecord establishing a connection.
#176 - Force metadata calls for attributes to use current value if attribute value is changing.
#173 - Update link to diff-lcs.
#172 - Save object_changes on creation.
#168 - Respect conditional :if or :unless arguments to the has_paper_trail method for destroy events.
#167 - Fix originator method so that it works with subclasses and STI.
#160 - Fixed failing tests and resolved out of date dependency issues.
#157 - Refactored class_attribute names on the ClassMethods module for names that are not obviously pertaining to PaperTrail to prevent method name collision.