[render-order] Move all dependencies to devDependencies

[vincentfretin]

This closes #345
I also updated test dependencies (same requirement range as in the aframe repo) so we can run npm install again (we couldn't because of a sinon requirement), move from karma-browserify to karma-webpack, and updated example to aframe 1.8.0, don't use eval in non minified build.

[vincentfretin]

I already updated the version in package.json and README.
You just need to run

rm -rf node_modules
npm install
npm run dist

commit the dist and publish to npm.