QUA-464: update CircleCI config (#35)

Revert "Rewrite in Javascript" (#31)

This reverts commit 1b0fa66.

Rewrite in Javascript

Notable changes:

* Droppped Ruby from dependencies
* Direct access to CoffeeLint APIs
* Faster execution
* CoffeeLint 2.0

Bumps coffeelint 1.15.7 -> 1.16.0 (#28)

* Bumps coffeelint 1.15.7 -> 1.16.0

* Fixes misconfigured circle.yml

Add spec asserting warning-level issuess included

Remove `-q` parameter from coffeelint call to also receive warnings

Merge pull request #22 from codeclimate/abh-badge

Update badge - use OSS link

Merge pull request #21 from codeclimate/abh-config

Always specify coffeelint.json as default config

Merge pull request #20 from codeclimate/abh-update-dockerfile

Update dockerfile

Merge pull request #19 from codeclimate/abh-circle-update

Update circle file