Remove active link colour that is applied to telephone numbers in...

...  Mobile Safari

**Before**
![before](https://cloud.githubusercontent.com/assets/1579511/3171248/f8c6619a-ebc3-11e3-9678-d04d7aa30a86.png)

**After**
![after](https://cloud.githubusercontent.com/assets/1579511/3171249/fb3d314c-ebc3-11e3-85ef-7d8b7d902d2d.png)