Deprecated features will be removed at V1

• Old TailInput. TailInput will be an alias of NewTailInput
  • in_tail_multiline and in_tail_ex are already merged into in_tail
• Old configuration format. V1 configuration is used by default. http://docs.fluentd.org/articles/config-file#v1-format
• Remove Rubygems 1.7 or earlier support in plugin lookup
• Old return time, record parser API. Use yield time, record instead
• out_forward's host and port
• old msgpack-ruby support. Require 0.7 or later
• Cool.io 1.1.x support. Require 1.2.x or later
• Remove detach_process