fix: using local rather then imported so access the actual variable

in something like `import { foo as bar } from 'fee';` `foo` is the 
imported part, while `bar` is the local. we just want the local
this enables one to import other `styleNamespaces` and use them in
the component.

lib/babel-add-style-namespace.js

@@ -49,7 +49,7 @@ module.exports = function ({ types: t }) {
       },
 
       ImportSpecifier(path) {
-        if (!this.found && path.get('imported').isIdentifier({ name: STYLE_NAMESPACE_PROPERTY.NAME })) {
+        if (!this.found && path.get('local').isIdentifier({ name: STYLE_NAMESPACE_PROPERTY.NAME })) {
             this.found = true;
             path.stop();
         }