upgrade codelyzer and enable a11y rules (#1391)

* upgrade codelyzer and enable a11y rules

* a11y fixes

package.json

@@ -86,7 +86,7 @@
     "adf-tslint-rules": "0.0.7",
     "ajv-cli": "^3.0.0",
     "chrome-remote-interface": "^0.26.1",
-    "codelyzer": "^4.5.0",
+    "codelyzer": "^5.2.2",
     "cpr": "^3.0.1",
     "cspell": "^3.2.17",
     "dotenv": "6.2.0",
@@ -114,7 +114,7 @@
     "ts-node": "^8.0.3",
     "tsickle": "0.34.0",
     "tslib": "^1.9.0",
-    "tslint": "~5.11.0",
+    "tslint": "^5.20.1",
     "typescript": "3.2.4",
     "wait-on": "^3.0.1",
     "webdriver-manager": "12.1.7"