fixed the type of iterator uses in MWWorld::Store

The containers type used to declare some iterators was not an exact match for the type of the container the iterator was being initialized from. This was causing build failure on windows.
Rank condition should always fail if NPC is not in a faction
Merge remote-tracking branch 'scrawl/master'
Merge remote-tracking branch 'scrawl/rank'
updated changelog once more
Use one vertex buffer for all UV coordinates