fix lint (and make yarn lint run stylelint)

Author: mmalerba

package.json

@@ -21,7 +21,7 @@
     "test": "node ./scripts/run-component-tests.js",
     "test-local": "yarn -s test --local",
     "test-firefox": "yarn -s test --firefox",
-    "lint": "yarn -s tslint && yarn -s bazel:format-lint && yarn -s ownerslint",
+    "lint": "yarn -s tslint && yarn -s stylelint && yarn -s bazel:format-lint && yarn -s ownerslint",
     "e2e": "bazel test //src/... --test_tag_filters=e2e",
     "deploy-dev-app": "node ./scripts/deploy-dev-app.js",
     "breaking-changes": "ts-node --project scripts scripts/breaking-changes.ts",

src/dev-app/list/list-demo.scss

@@ -16,7 +16,7 @@
   }
 
   .mat-list-icon {
-    color: rgba(0,0,0,.38)
+    color: rgba(0, 0, 0, 0.38);
   }
 }