Merge pull request #126 from luhcas/master

Kleine Anpassungen für ausgewählte Sektionen
Merge pull request #127 from luhcas/master

Ausgewähltes Kapitel besser erkennbar
use Composer for autoloading
Merge pull request #125 from xabbuh/autoload-composer

use Composer for autoloading
add a block to display a Blubber stream, refs #8
only show blubber threads tagged with block-<blockid> to allow more than one BlubberBlock in a certain course, refs #8
hide tags that are used to filter threads for blocks, refs #8
ensure that filter tags are set properly on new Blubber threads, refs #8
add datafields for preview image and video, show preview image in infobox
load constants always
add answers strategy for cloze exercises
use absolute paths instead of relying on the include_path being set properly, closes #129
fix wrong namespaces for HtmlBlock and IFrameBlock
Abstände und Sektionsansicht bearbeitet