fixed parsing for HTML comments
removed dead code
fixed upload
reload menu after upload and save
save old file to attic
added meta data. find a bug in Json::operator=
fixed bugs
thinking about how to implement the meta editor
remove the file if it is empty
use mtime instead of now
added property block. usage $.data() to store wb_base
added property query and toggle
added a link back to the page in the property page
show meta data for non-page resources, but the property pages is not updated yet
added mime type to property page. the link works.