Migrate to ESLint for linting

Author: eriwen

gulpfile.js

@@ -1,6 +1,7 @@
 var coveralls = require('gulp-coveralls');
 var del = require('del');
 var gulp = require('gulp');
+var eslint = require('gulp-eslint');
 var karma = require('karma');
 var rename = require('gulp-rename');
 var runSequence = require('run-sequence');
@@ -10,6 +11,13 @@ var uglify = require('gulp-uglify');
 var sources = 'stackframe.js';
 var minified = sources.replace('.js', '.min.js');
 
+gulp.task('lint', function() {
+    return gulp.src(sources)
+        .pipe(eslint())
+        .pipe(eslint.format())
+        .pipe(eslint.failAfterError());
+});
+
 gulp.task('test', function(done) {
     new karma.Server({
         configFile: __dirname + '/karma.conf.js',

karma.conf.js

@@ -17,7 +17,7 @@ module.exports = function (config) {
                 flags: ['--no-sandbox']
             }
         },
-        browsers: ['PhantomJS2'],
+        browsers: ['PhantomJS'],
         singleRun: false
     });
 };