[core] Added support for updating notes.

Regards #106
[sailfish] Added support for updating notes.

Regards #106
[core] Used more meaningful names
[sailfish] Fixed cropping in “All articles” feed

Regards #127
[sailfish] Fixed cropping in CategoryDelegate

Regards #127
[core] Only mark unread items as read
[core] Generalize markAllAboveAsRead()

This is needed when using a RemorseItem on sailfish as the selected
item might have changed between starting the RemorseItem and its
execution.
[sailfish] Added RemorseItem to markAllAboveAsRead()
[sailfish] Don't catchup but mark all loaded as read when in a feed

It's still possible to catchup by using the context menu of the feed.
Merge pull request #137 from michael-k/v0.4.x

Fixes for 0.4.6
updated chinese translations
[sailfish] properly load all feeds on startup if specified, see commit 9c8d4c93b44ad629d67e75e4b0ac02a9cd1b6aa1
[sailfish] version bump
Merge branch 'v0.4.x'
Merge pull request #132 from michael-k/notes

[core][sailfish] Support for updating notes
[sailfish] show the load more button when viewing oldest first and feed has more items, fixes #124
Merge pull request #133 from michael-k/mark-read

Mark all (above/loaded) read