[myspace] Update extractor

fixed download and added support for downloading albums
Something like this?
```python
_TESTS = [{
    'url': 'https://myspace.com/starset2/music/album/transmissions-19455773',
    'info_dict': {
        'title': 'Transmissions',
        'id': '19455773',
    },
    'playlist_count': 14,
}]
```
So should I close this pull request and create a new one (or two)?