Run test:saucelabs script on CI

[robframpton]

No description provided.

[jbalsas]

Hey @Robert-Frampton, I'm going to merge since this is a step in the right direction :D

I see we're still using gulp to run metal-tools-soy. Are you planning on getting rid of that as well and rely on npm scripts only on a different PR?

[robframpton]

Hey @jbalsas

I left it because the gulp portion isn't just compiling the soy, but it's also modifying some paths. Gulp is not a bad tool for doing things like this, so I didn't see the need in changing it at this time.