Fix spinner

The chat view has two spinners. It looks quite strange. The default ionic spinner should not show at all. So I also went ahead and just took out the icon as well.

Before- 
![chat_before](https://cloud.githubusercontent.com/assets/6372245/3742192/93fc6ede-1766-11e4-877e-beea22331d3d.png)

After-
![chat_after](https://cloud.githubusercontent.com/assets/6372245/3742193/989a371e-1766-11e4-9505-b56f097f62d9.png)