Use ESHint

Remove "jshint" dev dependency from package.json and the gulp task.

sh:

``` sh
npm install gulp-eslint --save-dev
```

gulpfile.js:

``` js
var eslint = require('gulp-eslint');

gulp.task('lint', function () {
return gulp
.src(['./src/*.js', './src/cinemas/*/*.js', './tests/*.js'])
.pipe(eslint())
.pipe(eslint.format())
.pipe(eslint.failOnError());
});
```

.eslintrc:

``` json
{
"rules": {
"no-console": 0,
"no-extra-parens": 2,
"no-reserved-keys": 2,
"no-eq-null": 2,
"no-extend-native": 2,
"no-process-env": 2,
"no-self-compare": 2,
"no-void": 2,
"no-warning-comments": [1, { "terms": ["todo", "@toto"], "location": "start" }],
"vars-on-top": 2,
"wrap-iife": [2, "inside"],
"global-strict": [2, "always"],
"new-cap": 0,
"no-shadow": 0,
"no-mixed-requires": 0,
"no-new-require": 2,
"brace-style": [2, "1tbs"],
"comma-style": [2, "last"],
"func-style": [2, "expression"],
"no-inline-comments": 2,
"no-lonely-if": 2,
"no-multiple-empty-lines": 2,
"no-nested-ternary": 2,
"one-var": 2,
"operator-assignment": [2, "always"],
"padded-blocks": [2, "never"],
"quote-props": [2, "as-needed"],
"quotes": [2, "single"],
"space-after-keywords": [2, "always"],
"space-before-blocks": [2, "always"],
"space-in-brackets": [2, "never"],
"space-in-parens": [2, "never"],
"space-unary-ops": [2, { "words": true, "nonwords": false }],
"spaced-line-comment": [2, "always"],
},
"env":{
"mocha": true,
"node": true
}
}
```