chore(~): use ESlint (closes #117)

[dtinth]

But not working yet

Blockers:

• no-undef error on ES6 import eslint/eslint#1978
• ES6 classes seem to cause parse error? (Not investigated yet)

[akibot]

Hello! Thank you for sending us patches!

I am an automated bot to lint pull requests to detect potential errors and check for consistent coding style, and I found some problems with your code submission in the commit 5d02f96:

• tasks/lint.js
  • line 4, col 8: 'jshint' is defined but never used. (W098)
  • line 5, col 8: 'jscs' is defined but never used. (W098)

Please fix these problems, rebase your commits, then leave a comment here so that a human can further review your patch.

As an additional step to prevent future lint errors, please run npm lint before committing. A Git pre-commit hook is available.

[coveralls]

Coverage remained the same at 98.03% when pulling 4c06fb4 on eslint into 5a8be21 on master.

[coveralls]

Changes Unknown when pulling 611281f on eslint into * on master*.