Behold a global spinner

Created a spinner component with an absolute position. Can use separately or call the global instance. Can also use the spinner "react-spinner" by itself if desired.
Right now, only shows the spinner without altering the background

![image](https://cloud.githubusercontent.com/assets/4157103/4942423/dff3d2c2-65eb-11e4-9d40-f6df3b8d59d0.png)


<!---
@huboard:{"order":5.0,"milestone_order":5,"custom_state":""}
-->

I think this should be wrapped within your `.mk-spinner` definition.