Fix placeholder splitting

[gerriet-hinrichs]

Update splitting by not just simply using the placeholder itself but by making it context aware:

• Handle cases where the trailing semicolon is removed
• Handle cases where minification merged a required semicolon with the one from the placeholder

Fixes #18 and #20

[coveralls]

Pull Request Test Coverage Report for Build 69

• 3 of 3 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 85.057%

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Totals
Change from base Build 63:	0.2%
Covered Lines:	85
Relevant Lines:	92

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💛 - Coveralls

[asyncLiz]

Thanks for the PR! I appreciate the contribution 🙂

The underlying issue for this has actually already been solved as part of the html template adjusting the CSS minify options to compensate for the semicolon being removed from the placeholder.

The same logic is not being applied to the css template minify options. I've created #22 that should address that issue and fix the two issues you've created.

Because of that, I'm going to go ahead and close this PR in favor of the other one. But thank you again for the detailed test cases and issues!