update(eslint): add eslint to package.json. Fix rules for 1.x.

Rules are disabled by default now, so just remove rules instead of marking false.
False now causes eslint to throw a type exception.
Add a basic EditorConfig file.

.editorconfig

@@ -0,0 +1,17 @@
+# EditorConfig helps developers define and maintain consistent coding styles between different editors and IDEs
+# editorconfig.org
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+
+# We recommend you to keep these unchanged
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.eslintrc

@@ -3,20 +3,9 @@
     "browser": true
   },
     "rules": {
-      "quotes": false,
-      "no-underscore-dangle": false,
-      "no-unused-expressions": false,
       "curly": [2, "multi-line"],
-      "strict": false,
-      "no-use-before-define": false,
-      "eqeqeq": false,
       "new-cap": [2, {"capIsNew": false}],
       "dot-notation": [2, {"allowKeywords": false}],
-      "no-console": false,
-      "no-return-assign": false,
-      "no-shadow": false,
-      "comma-dangle": false,
       "camelcase": [2, {"properties": "never"}]
     }
 }
-

package.json

@@ -4,6 +4,7 @@
     "babel": "5.8.21",
     "browser-sync": "2.8.2",
     "del": "1.2.0",
+    "eslint": "^1.9.0",
     "gulp": "3.9.0",
     "gulp-autoprefixer": "2.3.1",
     "gulp-sass": "2.0.4",