v1.1

@evilpie
Fix ATOM feed site link parsing
Fix siteUrl when subscribing
Remove unused discovered feed count
Use XMLHttpRequest instead of fetch to handle encoding issues

@nt1m
Fix OPML export
Close settings dialog on change
Add 'Refresh livemark' context menu item
Update livemark when the feedUrl/siteUrl/maxItems were changed
Add UTF-8 charset on top of HTML pages