turn off no-catch-shadow eslint rule

We do not support IE 8 and earlier, so we turn this off.
See http://eslint.org/docs/rules/no-catch-shadow for more info.

.eslintrc

@@ -18,6 +18,7 @@
         "key-spacing": 0,
         "no-alert": 0,
         "no-console": 0,
+        "no-catch-shadow": 0,
         "no-extra-semi": 0,
         "no-loop-func": 0,
         "no-multi-spaces": 0,