Merge in_tail_ex features into in_tail. refs #269
Fix queue close and add comment for current limitation
Remove unused argument from stop_watchers
Set 60 seconds to refresh_interval default
Change rotation handling with start/stop overwrap for high throughput
Ignore Coolio's RuntimeException at shutdown phase
Remove unnecessary 'attr_accessor :log'
Fix truncated handling bug
Fix the bug which previous is not exist
Don't re-create IOHandler when log file is rotated
Remove unwatched entries from PositionFile at start
Refactor code with better method
Merge pull request #277 from fluent/merge-tail_ex

Merge in_tail_ex features into in_tail. refs #269