Ax unecessary call

Fix off-by-one error

in ruby, (0..matches.size) will include both sides in the range, which
means we'll get off-by-one error

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Fix improperly placed chunks

Resolve #65

- Also add even more tests for checking `ldiff` results against `diff` results.
- Fix issues with diff/ldiff output highlighted by the above tests.
- Add a parameter to indicate that the hunk being processed is the _last_ hunk;
  this results in correct counting of the hunk size.
- The misplaced chunks were happening because of an improper `.abs` on
  `#diff_size`, when the `.abs` needed to be on the finding of the maximum diff
  size.

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Ooops. Debugger

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Restore missing test

- Fix some more format issues raised by the missing test.
- Start fixing Rubocop formatting.

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Last RuboCop fixes

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Finalize diff-lcs 1.4

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Fix #44

The problem here was the precedence of `or` vs `||`. Switching to `||` resulted
in the expected behaviour.

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Resolve #43

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Typo

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Resolve #35 with a comment