Better printing of package version changes (fixes #464)

TODO:

- [x] Add channel information
- [x] Add features information
- [ ] Do something with the download information?
- [x] Link type
- [ ] Clean up the code maybe
- [ ] Fix long space between final version and channel name:
```
    python:  2.7.7-0 filer --> 2.7.7-2      filer
```
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