update eslint to 3.8.0

[SimonLab]

The new update add a new rule: func-name-matching

As we don't have any rules to only use function declaration (see #207) I think we should use func-name-matching to keep consistency, any other thoughts on this?

We also need to add the dependencies badges to know when a new version of eslint has been published, so:

• Add dependencies badge
• Add new rule for func-name-matching with a test for this rule also