Add syntax check exclusion; Clean up syntax

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Merge pull request php-curl-class#377 from zachborboa/master

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Merge pull request php-curl-class#366 from zachborboa/master

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Merge pull request php-curl-class#360 from zachborboa/master

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Merge pull request php-curl-class#355 from zachborboa/master

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Merge pull request php-curl-class#306 from zachborboa/master

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Merge pull request php-curl-class#296 from zachborboa/295

Allow setting a custom XML decoder

Merge pull request php-curl-class#294 from zachborboa/master

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