changed ld flags to alleviate Class conflcts due to nested frameworks.

To solve this.  "Listener become the "Umbrella Framework", as it
depends on "CouchbaseLite.framework".  Subsequently.. apps need only
link to the umbrella... "Listener".

fixes #
![130917-0002](https://f.cloud.github.com/assets/262517/1160059/18669c76-1fd3-11e3-8d1a-7a3501d33544.png)
![130917-0001](https://f.cloud.github.com/assets/262517/1160060/186d208c-1fd3-11e3-9dc8-ab68ba2ea472.png)

125