Added new ES6 rule, introduced in eslint 0.23.0
> This rule is aimed to flag variables that are declared using let keyword, but never modified after initial assignment.
In `eslint-plugin-react`'s page on their sorting rules they show the order I showed here. https://github.com/yannickcr/eslint-plugin-react/blob/master/docs/rules/sort-comp.md#rule-options
I noticed because according to the current rules `contextTypes` goes below `render` and I also noticed other methods were missing from the list. Since we're being specific we should also include the other methods and properties that `eslint-plugin-react` handles by default.
This adds a `.jshintrc` to the `linters/` directory. I just copied over
the settings from the `SublimeLinter` file, de-nesting the JSON object
by one level.
It means we'll have to maintain both files, but it's good to have a
basic `.jshintrc` for those of us that aren't using JSHint through
Sublime Text.
The Airbnb guide states: "Strings longer than 80 characters should be written across multiple lines using string concatenation."
I propose to add the maxlen option to enforce this rule: http://www.jshint.com/docs/options/#maxlen
However maxlen enforces the entire source code, not just a line of String. I would like to hear your thoughts on whether that is a beneficial enforcement to keep JS code at a set width.
