[Fix #445] Drop the LineContinuation cop

It's simply more trouble than it's worth. Pretty sure it won't be missed.
Release 0.12.0
Remove -s/--silent option in README
failing spec for WhileUntilDo auto-correct
Merge pull request #449 from tamird/tamird

failing spec for WhileUntilDo auto-correct
Remove whitespaces between condition and `do` with WhileUntilDo auto-correction

This fixes #449.
Use Parser::Source::Buffer#name instead of reading @name ivar directly
Allow end to be aligned with the start of the line containing do.

Fixes #447.
Merge pull request #451 from jonas054/block_end_multiline

Allow end to be aligned with the start of the line containing do.
Don't stop inspection of a file when there is a Parser warning.

A Parser error means we can't continue, but a warning is not so bad.
Refactor long method CLI#inspect_file.
Merge pull request #452 from jonas054/continue_after_parser_warnings

Continue after parser warnings
Add AllowAdjacentOneLineDefs config parameter for EmptyLineBetweenDefs.
Merge pull request #453 from jonas054/add_config_for_adjacent_one_liners

Add AllowAdjacentOneLineDefs config parameter for EmptyLineBetweenDefs.
Use reverse_each instead of reverse.each
Bump powerpack dep to 0.0.6
Leverage drop_last from powerpack
Add auto-correction to RedundantSelf cop
Refactor add_offence and auto-correct logic

* introduce `convention` and `warning` wrappers around add_offence
* add node to the offence info
* call `autocorrect_action` from `add_offence` instead of explicitly
Fix a typo