use devtools gem for metrics
rubocop autocorrect
added utf8 comment
Mostly syntax and style fixes.

* Rubocop syntax fix.
* Updated devtools.
relax metrics settings.
configure travis-ci rake task
more utf8 encoding comments.
really fix utf-8 encoding comment.
Merge pull request #7 from aq1018/devtools

Devtools
Merge branch 'master' into pluggable_formatter

* master:
  really fix utf-8 encoding comment.
  more utf8 encoding comments.
  configure travis-ci rake task
  relax metrics settings.
  Mostly syntax and style fixes.
  added utf8 comment
  rubocop autocorrect
  use devtools gem for metrics

Conflicts:
	lib/active_model/error_collecting/emulation.rb
	lib/active_model/error_collecting/human_message_formatter.rb
	spec/lib/active_model/error_collecting_spec.rb