support returning plain template variables from controller call in ControllerTestCase
use fully-configured url generator in unit tests (ControllerTestCase) which also knows about loaded plugins
fix bad paster command in install docs (thanks to Marcos Ribeiro for reporting the issue)
facebook opengraph meta
l10n/zh_CN: update Chinese translation (now 100%)
l10n: recompile Chinese catalog
move error controller to /errors.

By default Apache uses  a global alias for "/error" in the httpd.conf which means that users can not send error reports through MediaCore's error page (because that POSTs to /error/report).

To make things worse Apache (at least up to 2.4) has no "unalias" functionality so a MediaCore operator must always disable the alias for all virtual hosts (often that's impossible to do for example if you're on a shared host).

This change resolves the name clash by using the "/errors" prefix (extra "s" at the end) so error reporting works again also with Apache's default configuration.
fix exception when uploading new thumbnail
feed links are now added in controller functions to reduce the crazy Genshi py:match stuff
set gettext domain in templates to enable proper translation of plugin templates
merged origin/v0.10-stable
settings for player logo
first draft of embed_featured controller
first draft of ifram_featured.html
upload field name appearance_player_brand
import emned_featured
css class mcore-btn-player-brand
show_playerbar = True
draft to setup appearance_player_brand
media_player with show_player_brand=True param