Remove AccountInfoWidget
Account: banner_url is nullable
Utils: Close stream in download_async
Account: Close stream in update_avatar
PixbufButton: Scale background to widget size
style.css: Add pixbuf-button-round class

Which will be used on round pixbuf buttons
PixbufButton: Make round buttons possible
AvatarBannerWidget: Use buttons for avatar and banner
AvatarBannerWidget: Remove old properties/variables
Show filechoosers when avatar/banner get clicked
Add CropWidget
Add ImageCropDialog
examples: Add crop dialog example
Update PO files
Merge branch 'master'
TweetUtils: Don't remove the progress entry so often

Sometimes when we request n tweets, we only get n-1 from the server but
we're not at the end of the list. So just check for n-1 instead of n, it
will take one request more now and then but be more correct overall.