This release brings a few new cops, extended auto-correction support and plenty of bug fixes.

Below is the list of all the gory details. Enjoy!

### New features

* [#974](https://github.com/bbatsov/rubocop/pull/974): New cop `CommentIndentation` checks indentation of comments. ([@jonas054][])
* Add new cop `EachWithObject` to prefer `each_with_object` over `inject` or `reduce`. ([@geniou][])
* [#1010](https://github.com/bbatsov/rubocop/issues/1010): New Cop `Next` check for conditions at the end of an interation and propose to use `next` instead. ([@geniou][])
* The `GuardClause` cop now also looks for unless and it is configurable how many lines the body of an if / unless needs to have to not be ignored. ([@geniou][])
* [#835](https://github.com/bbatsov/rubocop/issues/835): New cop `UnneededPercentX` checks for `%x` when backquotes would do. ([@jonas054][])
* Add auto-correct to `UnusedBlockArgument` and `UnusedMethodArgument` cops. ([@hannestyden][])
* [#1074](https://github.com/bbatsov/rubocop/issues/1074): New cop `SpaceBeforeComment` checks for missing space between code and a comment on the same line. ([@jonas054][])
* [#1089](https://github.com/bbatsov/rubocop/pull/1089): New option `-F`/`--fail-fast` inspects files in modification time order and stop after the first file with offenses. ([@jonas054][])

### Changes

* `NonNilCheck` offense reporting and autocorrect are configurable to include semantic changes. ([@hannestyden][])
* The parameters `AllCops/Excludes` and `AllCops/Includes` with final `s` only give a warning and don't halt `rubocop` execution. ([@jonas054][])
* The `GuardClause` cop is no longer irgnoring a one-line body by default - see configuration. ([@geniou][])
* [#1050](https://github.com/bbatsov/rubocop/issues/1050): Rename `rubocop-todo.yml` file to `.rubocop_todo.yml`. ([@geniou][])
* [#1064](https://github.com/bbatsov/rubocop/issues/1064): Adjust default max line length to 80. ([@bbatsov][])

### Bugs fixed

* Allow assignment in `AlignParameters` cop. ([@tommeier][])
* Fix `Void` and `SpaceAroundOperators` for short call syntax `lambda.()`. ([@biinari][])
* Fix `Delegate` for delegation with assignment or constant. ([@geniou][])
* [#1032](https://github.com/bbatsov/rubocop/issues/1032): Avoid duplicate reporting when code moves around due to `--auto-correct`. ([@jonas054][])
* [#1036](https://github.com/bbatsov/rubocop/issues/1036): Handle strings like `__FILE__` in `LineEndConcatenation`. ([@bbatsov][])
* [#1006](https://github.com/bbatsov/rubocop/issues/1006): Fix LineEndConcatenation to handle chained concatenations. ([@barunio][])
* [#1066](https://github.com/bbatsov/rubocop/issues/1066): Fix auto-correct for `NegatedIf` when the condition has parentheses around it. ([@jonas054][])
* Fix `AlignParameters` `with_fixed_indentation` for multi-line method calls. ([@molawson][])
* Fix problem that appears in some installations when reading empty YAML files. ([@jonas054][])
* [#1022](https://github.com/bbatsov/rubocop/issues/1022): A Cop will no longer auto-correct a file that's excluded through an `Exclude` setting in the cop's configuration. ([@jonas054][])
* Fix paths in `Exclude` config section not being recognized on Windows. ([@wndhydrnt][])
* [#1094](https://github.com/bbatsov/rubocop/issues/1094): Fix ClassAndModuleChildren for classes with a single method. ([@geniou][])

[@bbatsov]: https://github.com/bbatsov
[@jonas054]: https://github.com/jonas054
[@yujinakayama]: https://github.com/yujinakayama
[@dblock]: https://github.com/dblock
[@nevir]: https://github.com/nevir
[@daviddavis]: https://github.com/daviddavis
[@sds]: https://github.com/sds
[@fancyremarker]: https://github.com/fancyremarker
[@sinisterchipmunk]: https://github.com/sinisterchipmunk
[@vonTronje]: https://github.com/vonTronje
[@agrimm]: https://github.com/agrimm
[@pmenglund]: https://github.com/pmenglund
[@chulkilee]: https://github.com/chulkilee
[@codez]: https://github.com/codez
[@emou]: https://github.com/emou
[@skanev]: http://github.com/skanev
[@claco]: http://github.com/claco
[@rifraf]: http://github.com/rifraf
[@scottmatthewman]: https://github.com/scottmatthewman
[@ma2gedev]: http://github.com/ma2gedev
[@jeremyolliver]: https://github.com/jeremyolliver
[@hannestyden]: https://github.com/hannestyden
[@geniou]: https://github.com/geniou
[@jkogara]: https://github.com/jkogara
[@tmorris-fiksu]: https://github.com/tmorris-fiksu
[@mockdeep]: https://github.com/mockdeep
[@hiroponz]: https://github.com/hiroponz
[@tamird]: https://github.com/tamird
[@fshowalter]: https://github.com/fshowalter
[@cschramm]: https://github.com/cschramm
[@bquorning]: https://github.com/bquorning
[@bcobb]: https://github.com/bcobb
[@irrationalfab]: https://github.com/irrationalfab
[@tommeier]: https://github.com/tommeier
[@sfeldon]: https://github.com/sfeldon
[@biinari]: https://github.com/biinari
[@barunio]: https://github.com/barunio
[@molawson]: https://github.com/molawson
[@wndhydrnt]: https://github.com/wndhydrnt