[Fix] Return valid line locations for code with no ast or nil nodes
Clean up line numbers code
Make AST Node wraper for line number s-expression nodes
Separate out sexp node dresser
Simplify line/method checking
LineNumbers parsing should rescue StandardError, not Exception
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Merge pull request #137 from bf4/cleanup_line_number_processing

Ensure valid line number locations. Cleanup line number processing, introduce SexpNode
Only use fake filesystem on mri

Fails on JRuby/Rbx
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