the plugin config-file tag for iOS plist array behaves unnaturally.

In the src/util/plist-helpers.js, in the nodeEqual function,
```
node2 = escapeRE(node2).replace(/\\\$\S+/gm, '(.*?)');
```
seems the strange behavior.
For example, the escaped node2 "$(ABC)Hello" becomes "(.*?)".

In the previous version of this code is
```
node2 = escapeRE(node2).replace(new RegExp('
$[a-zA-Z0-9-_]+','gm'),'(.*?)');
```
in this case, the escaped node2 "$(ABC)Hello" is unchaned.