Fixed issues with throwing exceptions when accessing "Find shows for artists in iTunes library"

Hi there, I'm not a python expert although i've been a developer for over 25 years in various different languages but this ones puzzled me a little. I could never get your plugin to connect to my iTunes library. There are so many issues with so many plug-ins that i just put it down to my environment but it always bugged me as it's a really interesting project, so i had a quick sniff at the logs and ran though the code and realised that you were referencing iTunesPage() but itunesPage() .... Now, this is a fairly trivial and easy thing to debug which i'm sure you would have spotted had it affected you, so, it left me wondering  ... Is python case insensitive to function names in some environments? ... If so that's a big "Bloody Hell!" in disbelief from over here. 

Anyway, seeing as you used camelCase throughout your code i normalised all your iTunes references and all seems to be fine now this end although i'm afraid it's not backed up with any tests as i considered the fix to be too trivial.

Thanks for the plugin it's a good one.