Allow colors to continue across lines

[haltman-at]

(Apologies about this PR accidentally including my previous one as well. If it turns out you like this one but not the previous one, well, we can figure out how to rebase things to separate it out later. Sorry, I didn't think I was going to be making multilpe PRs!) (Fixed this now.)

This PR fixes a bug whereby colors won't continue across lines. This is because chromafi currently colors the code line-by-line rather than all at once. So, I've modified the code to simply colorize all at once. Now, colors can continue across lines.

Thanks!

[coveralls]

Pull Request Test Coverage Report for Build 46

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.8%) to 98.872%

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Files with Coverage Reduction	New Missed Lines	%
index.js	1	98.87%

Totals
Change from base Build 37:	-0.8%
Covered Lines:	180
Relevant Lines:	181

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💛 - Coveralls