Hard-Coded bundle params + few extra strings removed #714

[MattiaPrimavera]

Done for fragments package bundle parameters + some other hard-coded strings ;)

[maniac103]

I'd prefer if the string constants had an EXTRA_ prefix to make their usage more obvious. Also, the filter and sort strings should be moved to the Github API bindings instead.

[MattiaPrimavera]

Argh I though about the prefix, was not sure on your conventions ...

[Tunous]

Not sure if we follow this rule elsewhere but I think it's a good idea to keep static fields above instance fields. I saw that you placed them together in some files.

[maniac103]

Not sure if we follow this rule elsewhere but I think it's a good idea to keep static fields above instance fields.

:+1: If we don't do it in all places yet, we definitely should do that.

[Tunous]

I've rebased this onto master, fixed mentioned issues and added similar constants to activity files.