Remove junk (.log, .aux, etc) files upon success

[amoeba]

I never look at the extra files pdflatex spits out such as .log, .aux. I would like an option to remove these extra files.

I made some tweaks on:

http://github.com/amoeba/TeXorator/commits/remove_junk_files

I've never coded in Objective-C or used Cocoa before so pardon my code.

Removal of .log, .aux and syntex.gz implemented. I don't know if there are others.