Improves remove button, adds removeFeed function
Improves remove button, adds removeFeed function

Fixes and improves the way the remove button and the way the refresh button works. Adds the removeFeed function, creates a new window and populates it with all the feeds found on file. Clicking a button removes the feed from the urls list and skips it when writing to file. This removes the entry in sites.txt.
powderblock/PyRSS,mhcrnl/PyRSS