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Remove special offset handling for EOFs.

They can just use the position provided by the lexer.
Merge pull request #749 from michaelpj/sign-agreement

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Merge pull request #738 from michaelpj/fix/eof-offsets

Fix character offsets for EOFs after newlines
add self to contributors.txt
Merge pull request #750 from bdkearns/sign
Merge remote-tracking branch 'antlr-origin/master'