Revert "back capability for activesupport 3.0"

This reverts commit 7ff7c6587f495234616452e08d4d807b487de4d6.

Conflicts:
	lib/entity_logger/configuration.rb
	lib/entity_logger/mixin.rb
	lib/entity_logger/tagged_logging.rb
Fix activesupport version
use tags from caller class if it uses the same logger_writer