Convert spec/javascripts/.eslintrc to yml format as well

spec/javascripts/.eslintrc

-{
-  "env": {
-    "jasmine": true
-  },
-  "extends": "plugin:jasmine/recommended",
-  "globals": {
-    "appendLoadFixtures": false,
-    "appendLoadStyleFixtures": false,
-    "appendSetFixtures": false,
-    "appendSetStyleFixtures": false,
-    "getJSONFixture": false,
-    "loadFixtures": false,
-    "loadJSONFixtures": false,
-    "loadStyleFixtures": false,
-    "preloadFixtures": false,
-    "preloadStyleFixtures": false,
-    "readFixtures": false,
-    "sandbox": false,
-    "setFixtures": false,
-    "setStyleFixtures": false,
-    "spyOnDependency": false,
-    "spyOnEvent": false,
-    "ClassSpecHelper": false
-  },
-  "plugins": ["jasmine"],
-  "rules": {
-    "func-names": 0,
-    "jasmine/no-suite-dupes": [1, "branch"],
-    "jasmine/no-spec-dupes": [1, "branch"],
-    "no-console": 0,
-    "prefer-arrow-callback": 0
-  }
-}

spec/javascripts/.eslintrc.yml

+---
+env:
+  jasmine: true
+extends: plugin:jasmine/recommended
+globals:
+  appendLoadFixtures: false
+  appendLoadStyleFixtures: false
+  appendSetFixtures: false
+  appendSetStyleFixtures: false
+  getJSONFixture: false
+  loadFixtures: false
+  loadJSONFixtures: false
+  loadStyleFixtures: false
+  preloadFixtures: false
+  preloadStyleFixtures: false
+  readFixtures: false
+  sandbox: false
+  setFixtures: false
+  setStyleFixtures: false
+  spyOnDependency: false
+  spyOnEvent: false
+  ClassSpecHelper: false
+plugins:
+  - jasmine
+rules:
+  func-names: off
+  jasmine/no-suite-dupes:
+    - warn
+    - branch
+  jasmine/no-spec-dupes:
+    - warn
+    - branch
+  no-console: off
+  prefer-arrow-callback: off