Adjust the yoda ESLint rule to apply to inequalities as well

I happened to notice that some inequalities had the wrong order, and was surprised since I thought that the `yoda` rule should have caught that.
However, reading http://eslint.org/docs/rules/yoda#options a bit more closely than previously, it's quite obvious that the `onlyEquality` option does *exactly* what its name suggests. Hence I think that it makes sense to adjust the options such that only ranges are allowed instead.

src/core/evaluator.js

@@ -1614,7 +1614,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
               var type = xobj.dict.get('Subtype');
               assert(isName(type), 'XObject should have a Name subtype');
 
-              if ('Form' !== type.name) {
+              if (type.name !== 'Form') {
                 xobjsCache.key = name;
                 xobjsCache.texts = null;
                 break;