main mobile browsers. fixes #54

What a good-looking set of mobile browser logos. :)

Opera Mini basically uses this same `opera` logo. 

The main usecase I have for this and the other one are web developer talks about browser support. 

Anyway, cheers.

<hr>

Yes, @alrra I just lazily hacked the .sh file with:

```sh
declare -a imageGroup=(
    "android"
    "safari-ios"
    "chrome-android"
    "internet-explorer-tile"
    "opera"
)
```

Not sure how you'd prefer to handle it the real way. :)