Status bar refactor and  nicer tool buttons 

This PR refactors some of the UI in the status bar to make things a little clearer.

Changes:
 - Project CRS text and button are now merged making it easier to hit
 - New icon for log messages with messages text.   The old icon was a bit alarming and might make people avoid looking there for messages.

You can see the difference below:

![statusbar](https://cloud.githubusercontent.com/assets/381660/5583973/4abc1d06-90cd-11e4-9c90-e69bb6ea6fc6.png)

I have always found the small icons hard to see and hit.  Users during training seasons have also clicked the label expecting to see a dialog to pick the CRS not knowing it's the small button beside it.