Commits on Dec 15, 2016

1. Fix segmentations failure in error.c gumbo_caret_diagnostic_to_string …

   Without this patch method find_last_newline returns value bigger than
   find_next_newline and in line `original_line.length = line_end -
   line_start;`
   overflow happens.
   
   Before changes newly added test failed with segmentation failure:
   ```
   ./test-driver: line 107: 12171 Segmentation fault      (core dumped)
   "$@" > $log_file 2>&1
   ```
   
   This slightly changed copy of code used in nokogumbo gem.
   [Link](https://github.com/rubys/nokogumbo/blob/8b4446847dea5c614759684ebcae4c580c47f4ad/ext/nokogumboc/nokogumbo.c#L230)

   

   DmitryBochkarev committed Dec 15, 2016
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