[collapse] Add Accordion support, ARIA, and test suite#519

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tmorehouse merged 49 commits intobootstrap-vue:masterfrom

tmorehouse:collapse-accordion

Jun 17, 2017

Commits on May 16, 2017

[carousel] Fixed this arg in forEach
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Commits on May 18, 2017

Merge pull request #3 from bootstrap-vue/master
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Merge pull request #6 from bootstrap-vue/master
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Merge pull request #7 from bootstrap-vue/master
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Merge pull request #11 from bootstrap-vue/master
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Merge pull request #12 from bootstrap-vue/master
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Commits on Jun 17, 2017