Blue colour badges

In issue [#111](https://github.com/mstarke/MacPass/issues/111) from the MacPass repo, it was requested to change the badge colour from grey to blue (like in Mail.app).  The notion was accepted so I went ahead and edited the required file.

RGB component selection:
I used the DigitalColor Meter Mac app and retrieved the native RGB values from Mail.app.  Then divided each one by 255.

Before:
![before](https://cloud.githubusercontent.com/assets/5186556/4381355/ab0991da-4374-11e4-829e-2e3521bb4e85.jpg)

After:
![after](https://cloud.githubusercontent.com/assets/5186556/4381332/57e0b1f0-4374-11e4-8c2d-cc8e0e3160ac.jpg)