CircleCI 2.0 compliance. Yay!

[Martin Bruse]

After building the new version with support for phones with broken back buttons (someone reviewing had that problem, and I felt that it was easy enough to fix that I couldn't ignore it), I realized that CircleCI has now officially deprecated (but still not removed support for?) format 1.0 of their config files.

So I spent a couple of painful hours converting the build to their 2.0 format.

Now it works! Wohoo! And it builds MUCH faster :D

[tttppp123]

Woooo! Well done!