Enable quote-props "as-needed"

This rule aims to enforce use of quotes in property names, only
in cases where they are strictly required (such as +/- in the name).
In all other cases, it will point out unecessary quotes.

http://eslint.org/docs/rules/quote-props

Change-Id: I7925329a3291ddb836ba9d971bdab529848596de

.eslintrc

@@ -686,7 +686,9 @@ rules:
 
   # Require quotes around object literal property names
   # http://eslint.org/docs/rules/quote-props
-  quote-props: 0 # TODO(krotscheck): Discuss & Activate
+  quote-props:
+    - 2
+    - "as-needed"
 
   # Specify whether backticks, double or single quotes should be used
   # http://eslint.org/docs/rules/quotes