chore(tslint): disallow variable names that look like keywords.

We've had issues such as the one I documented: https://github.com/Microsoft/TypeScript/issues/5187
This tslint check prevents this happening again.
This change also updates to the newest tslint which gets typings from npm.

Closes #4970

package.json

@@ -78,7 +78,7 @@
     "gulp-sourcemaps": "1.3.*",
     "gulp-template": "^3.0.0",
     "gulp-traceur": "0.17.*",
-    "gulp-tslint": "^3.3.0-beta",
+    "gulp-tslint": "^3.4.0",
     "gulp-typescript": "^2.9.0",
     "gulp-uglify": "^1.2.0",
     "gulp-webserver": "^0.8.7",
@@ -130,7 +130,7 @@
     "through2": "^0.6.1",
     "ts2dart": "^0.7.12",
     "tsd": "^0.6.5-beta",
-    "tslint": "^2.5.0",
+    "tslint": "^3.0.0-dev.1",
     "typescript": "^1.6.2",
     "universal-analytics": "^0.3.9",
     "vinyl": "^0.4.6",