Rework LineEndConcatenation with tokens rather than AST
[Fix #1054] Handle a case with a return value of method on a string
Merge pull request #1529 from jonas054/1054_rework_line_end_concatenation

Rework line end concatenation
Remove unused code

It seems that ASP::Processor#process calls #on_if (and not #on_unless)
when encountering an `unless` node.
Remove unused method

This method was left behind after commit 623a886862f15083672057e4fe7a.
Remove unused method
Spec for invalid configuration of Style/Next
Spec for invalid configuration of GuardClause
Spec for invalid config of SpaceInsideBlockBraces
Merge pull request #1535 from bquorning/remove-unused-code

Remove unused code
Merge pull request #1534 from bquorning/spec-invalid-configuration

Spec invalid configuration
Merge branch 'master' into fix-autocorrect-bracesaroundhashparameters-leaves-extra-space