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Fix scrolling popup content on Firefox
Merge pull request #1861 from Leaflet/asset-artifacts

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fix touch styles for leaflet-bar class
avoid vector flickering on Mac Safari more often, #902
update changelog and bump version to 0.6.3
Merge branch 'master' into stable

* master:
  update changelog and bump version to 0.6.3
  avoid vector flickering on Mac Safari more often, #902
  fix touch styles for leaflet-bar class
  Fix scrolling popup content on Firefox
  Upload individual asset artifacts
  Try fixing Travis not building pull requests