Feature request: browserstack tests

[jantimon]

Ally.js uses browserstack (free for open source) to test the library against a bunch of browsers:

https://github.com/medialize/ally.js/blob/master/test/browserstack.js#L24-L72

This might be also quite useful to guarantee a browser matrix

[fregante]

It would be nice but I'm not familiar with browser testing setup. PRs welcome

[jantimon]

See #5

[fregante]

Thanks! 🙂