Microbundle

[krzepah]

Has been tested in a sandbox with link, package.json is taken from unistore's and here are the changes :

• added node 4 -> 10 in .travis.yml
• no more rollup config & all kind of other dependencies that were used for the old build system
• added bundlesize (744B)
• eslint with developit config
• unit & e2e test setup with jest (wip)
• example folder and example command to launch it