Refactored mixins into utils
ES2015 module exports
ES2015-style imports
WIP Fixing tests
Fixes tests after es2015 code migrations.
We we're require()ing an ES2015 module[1]. Have to make sure you account
for the .default in this case.
[1] We had to use ES5 `require` in Jest:
(https://github.com/babel/babel-jest/issues/16)
edges can have different point counts between updates, that throws
Spring off, therefor I'm making sure the number of points is always 10.
If anyone can find out how many points dagre maximally puts, please
change this (my guess is max. 4).
