fixed for premailer inline

`!important` and some CSS were causing premailer to barf. 
Simplified this:
```
 /* Take care of image borders and formatting */
img {
    max-width: 600px;
    outline: none;
    text-decoration: none;
    -ms-interpolation-mode: bicubic;
}

a {
    text-decoration: none;
    border: 0;
    outline: none;
}

a img {
    border: none;
}
```

To this:

```
  img {
    max-width: 600px;
    -ms-interpolation-mode: bicubic;
  }

  a img {
      border: 0;
      outline: none;
      text-decoration: none;
  }
```