[TxMt] on find in project

[Caio Chassot]

1. better progress indication would be great, one of those spinner 
things below the buttons would do it. Also a way to abort an ongoing 
search would save me so many force quits.

2. I'd love to have a file path regexp filter, so, say, it only 
searches in files matching \.rb$ (I suppose glob would be nice for such 
simple cases, but not at the expanse of the ability to use regexps when 
needed, i think)