Fix wordWrap with colSpan

[mmurphy]

wordWrap across the colSpan width and not just the first column
fixes #19

let me know if you think this needs to be more defensive

[coveralls]

Coverage increased (+0.002%) to 99.817% when pulling eace7c6 on mmurphy:fix_wordwrap_with_colspan into 6b07944 on jamestalmage:master.

[mmurphy]

@jamestalmage hi, this is just a reminder that this PR is here, in case you are interested

[jamestalmage]

Thank you!