[ESLint] add meteor specific style guide

[luclu]

Unfortunately ESLint is unable to relate to meteor's scopes, thus variables are recognized as undefined. There are two ways around this:

1. disable the no-undef rule for the interface directory
2. add any defined variables in a config-comment line in each file specifically
3. leverage meteor lint command (more complicated setup)

This PR currently opted for (1).

There is also a nice meteor-plugin for ESLint https://github.com/dferber90/eslint-plugin-meteor,
unfortunately it is not yet supported by code-climate and will error out.

[mention-bot]

@luclu, thanks for your PR! By analyzing the history of the files in this pull request, we identified @frozeman, @hiddentao and @alexvandesande to be potential reviewers.

[evertonfraga]

sounds good to me

[lock]

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