[Fix] Update window title when saving NIF

When the NIF filename is changed (i.e. saving to a new file) the window
title was no longer updating.  Caused in 8ed1428
[Fix] Invert UVWidget zoom

The zooming in the UV editor was unnatural, as nearly everything in
existence uses the opposite directions for zoom in/out.
Merge pull request #65 from jonwd7/alpha/1.2a2

Alpha/1.2a2