Handle spaces in parens in srcset descriptors. Fixes #180
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Merge pull request #181 from zcorpan/fix-180

Handle spaces in parens in srcset descriptors. Fixes #180
Skip past commas before the URL in srcset. Fixes #182
Merge pull request #184 from zcorpan/fix-182

Skip past commas before the URL in srcset. Fixes #182
Drop candidates with negative x descriptors. Fixes #183
Merge pull request #185 from zcorpan/fix-183

Drop candidates with negative x descriptors. Fixes #183