[PFS] Pathfinder Society guide renamed and needs update

I plan on implementing this and version 7 similar to new sources. The ideas is that the multi-sets Core Assumption and Complete would always use the current version, but the user would be able to manually pick an earlier version. I have some thoughts on how I will do this, but they are not fully fleshed out since the implication (to be a consistent model) is that any Additional Resources versions (all the _pfs folders under each main source) going forward should also follow a similar model, linked to the version of the guide. Ultimately I may decide this idea (version selectable) is too much work. If that's the conclusion, I'll just implement the changes in 8 into the current model.

I will be finishing gtpsop as its final version, v6. That matches the official guide name and rules from Paizo. A new source for Pathfinder Society Guild Guide will be created for v8. I think I'm just going to skip v7, unless I see any significant differences between v7 and v8 that may warrant the need for a user to load a character using only the v7 rules.

I've submitted a PR. Waiting for Travis.