Stop using custom events in events hash

Part of #318
use new way of loading uris
Brace style test against minor browser difference

Might be 0pt or 0px or whatever.
do not add alternate languages as equivalent document

anchoring will fail in most cases for translated documents
Merge pull request #356 from scharf/issue_355

do not add alternate languages as equivalent document
Merge pull request #354 from scharf/issue_352

use new way of loading uris
basic documentation of the document plugin