SiteAPI: allow some post fields to fail
SiteAPI: allow some posts to fail

return the rest of the posts even if some of them failed.
SiteAPI: fix misordered shimmie post c-tor args
SiteAPI: fix shimmie fetchPosts()

giving empty string as tags field would actually requires the server to
search for no tag at all.
put a asterisk to match everything...
Model: clean-up commented codes.
PostList: fix filter preference layout on tablets

default layout for preference item have a padding on tablets, squeezes
the texts away.
we now use a custom layout with no padding.