added an update method
Formatted left panel light grey

Having trouble with how to format text. Turning text red works in a tiny
app, but not here. (Nor does it seem to work in the wxPython demo!)
Merge branch 'master' of https://github.com/JonathanHarford/weRenamer

Conflicts:
	weRenamer.py
Colored left textctrl grey to suggest uneditability.
Changed filenames now turn bold... sometimes.