Fix for share feed and scroll to top when changing current feed.
Style fix for Add Feed button

Make it easier to see if button is enabled or disabled.
Register intent-filter for RSS

Links now opened in AddFeedActivity with the URL added to the "Enter RSS
Feed URL" textbox.
Merge pull request #29 from N-Pex/master

Share feed fixes and rss intent filter (to add feed)
Merge remote-tracking branch 'upstream/master' into paik