Fix node positional information for files with single-quotes in comments

[nwalters512]

This resolves issue #163.

Please check one:

• New tests created for this change
• Tests updated for this change

This PR:

• Adds new API
• Extends existing API, backwards-compatible
• Introduces a breaking change
• Fixes a bug

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This PR is my attempt at resolving the issue described in #163. It makes the new tests I added pass, and it doesn't break any existing tests. Unfortunately, most of the existing tests don't assert anything about positional information, so it's pretty difficult for me to assert that this doesn't adversely impact anything else. I'd be happy to augment some existing tests with positional information to help increase confidence.

The change to lib/nodes/inline-comment.js was necessary to get the following assertion about the end position of a comment to pass:

t.is(innerCommentNode.source.end.column, 6);

[codecov-commenter]

Codecov Report

Merging #164 (83f0986) into master (c92f312) will increase coverage by 0.17%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   97.38%   97.56%   +0.17%     
==========================================
  Files           3        3              
  Lines         153      164      +11     
==========================================
+ Hits          149      160      +11     
  Misses          4        4              

Impacted Files	Coverage Δ
lib/index.js	100.00% <100.00%> (ø)

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[shellscape]

[nwalters512]

@shellscape do you have a rough estimate of when this will be released in a new version on npm?