Enable no-use-before-define

Disallow Early Use (no-use-before-define)

In JavaScript, prior to ES6, variable and function declarations are
hoisted to the top of a scope, so it's possible to use identifiers
before their formal declarations in code. This can be confusing and
some believe it is best to always declare variables and functions
before using them.

In ES6, block-level bindings (let and const) introduce a "temporal
dead zone" where a ReferenceError will be thrown with any attempt to
access the variable before its declaration.

http://eslint.org/docs/rules/no-use-before-define

Change-Id: Ia905b77e0938ac3e0279712bc6e5ccdb18a102e7

.eslintrc

@@ -465,7 +465,9 @@ rules:
 
   # Disallow use of variables before they are defined
   # http://eslint.org/docs/rules/no-use-before-define
-  no-use-before-define: 0 # TODO(krotscheck): Discuss & Activate
+  no-use-before-define:
+    - 2
+    - "nofunc"
 
   #############################################################################
   # Node.js rules