[Fix #512] Fix bug causing crash in AndOr auto-correction.

When checking if auto-correction changes the grammatical meaning of the node, we used the original node whose ranges refer to the whole file. Must use the new node we get from parsing the and/or expression.
Merge pull request #513 from jonas054/fix_and_or_crash

[Fix #512] Fix bug causing crash in AndOr auto-correction.
Extract method Util.source_length
New cop ClassLength
Code style
[Fix #515] Fix code-destroying bug in AlignParameters auto-correction.
Refactor AlignParameters.
Fix code-destroying bug in AlignArray auto-correction.
Extract common code from AlignParameters and AlignArray.

Move into the AutocorrectAlignment module.
Refactor AlignParameters spec.

Bring up-to-date and unify style internally in the file.
Merge pull request #517 from jonas054/fix_align_parameters_bug

Fix alignment auto-correction bug
[Fix #516] Fix RedundantReturn auto-correction bug.

Would generate invlid Ruby for return with an implicit array.
Merge pull request #518 from jonas054/fix_redundant_return_bug

[Fix #516] Fix RedundantReturn auto-correction bug.
[Fix #519] Make HashSyntax cop configurable
Move change to proper section of the changelog
[Fix #520] Make StringLiterals cop configurable.
Merge pull request #521 from jonas054/configurable_string_literals

[Fix #520] Make StringLiterals cop configurable.
Split FavorModifier by which cop they describe
Use #subject
Match spec offence messages with literal strings