Cherry pick style-spec build fixes from master#6603

Merged

anandthakker merged 5 commits intorelease-0.45from cp-style-spec-build

May 3, 2018

+96-81

Commits on May 3, 2018

Fix style-spec build (#6575 )

anandthakker
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Anand Thakker
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Ensure style-spec is published with mapbox-gl (#6586 )

anandthakker
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Anand Thakker
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Bump style-spec version to 12.0.0-pre.1 (#6595 )

anandthakker
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Anand Thakker
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Use named exports in style-spec.js (#6602 )

anandthakker
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Anand Thakker
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Ignore whole /dist/ directory
Anand Thakker
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