[Travis] Don't build tests when make fails
[Bookmarks] Cleanup in Bookmarks class
[Bookmarks] Importing bookmarks now works

It will however need a complete rewrite, the code is really bad.
HtmlImport: Supports importing bookmarks with full structure
[BookmarksSidebar] Activate bookmarks on mouseRelease

So it doesn't interfere with bookmarks reordering
[Bookmarks] Cache bookmark's icon for 20 seconds

BookmarksToolbarButton: Draw button according to BookmarkItem, not
text and icon properties