New shared linting configuration for our projects

[Antranig Basman]

Infusion has been the first of our libraries to be updated to the new, shareable ESLint configuration 
(thanks to Justin Obara for this great work). Our .eslintrc files have been traditionally cut and pasted 
across projects, which made for a lot of slop when adjustments needed to be made to the rules. It is now 
possible to share a config from a central location which is published as an npm module at 
https://www.npmjs.com/package/eslint-config-fluid

The configuration is used by declaring a (generally) empty .eslintrc.json file with an "extends" directive 
as so:

https://github.com/fluid-project/infusion/blob/master/.eslintrc.json

We should move over all our projects to this system as time permits.

Cheers,

Antranig