fix JSON syntax error in composer.json
Merge pull request #8124 from eins78/3.0.0-wip-fix-json

fix JSON syntax error in composer.json
Docs Customize toggle button used incorrect selectors
Docs Customize "Customize and Download" button not working properly
Merge pull request #8158 from baer/download-button-fix-proper

Docs "Customize and Download" button didn't send the correct parameters
Merge pull request #8156 from baer/toggle-button-fix

Docs Customize toggle button used incorrect selectors
Merge pull request #4 from twitter/3.0.0-wip

Sync with 3.0.0 wip