Update dependencies

[konstantinmagg]

Updated some outdated dependencies.

Started with some low hanging fruits: eslint, mocha, watch and parallelshell. Please review and test. Any comments are welcome ;)

Changes in detail:

• Updating eslint and its react plugin: New parser option sourceType and one violation in index.html
• Updating mocha: Changed arguments of mocha 'pre-require' emit
• Updating watch and parallelshell: No further changes needed

I tested the updated mocha library with some simple unit tests and examples from http://es6katas.org/, worked without problems.

[konstantinmagg]

Had to update the node version that Travis uses. Hope this ain't no problem?

[wolframkriesing]

sweet

[wolframkriesing]

looks like myth doesnt play with node 6 anymore ... I will try to remove myth first

[wolframkriesing]

please pull in the latest master, I removed the dependency on myth, which made npm start not work

[wolframkriesing]

let me just do that ... getting it done :)