Fixed issue with collapse map z-index

* Increased z-index on collapse map button to 1000 to overcome attributions
* closes #193 
* @middle8media -- need a review on this, thanks!

![screenshot 2013-12-12 09 09 36](https://f.cloud.github.com/assets/184092/1733409/1bea548a-6337-11e3-86af-026302d14bfe.png)