Correct HTML5 warnings for stream- and standalone page

Fixes #1226
Add simple on/off option to whether load dtm or not

This commit removes the dtm plugin and all dtm dependent plugins from
the guest.coffee and introduces a dtm parameter inside the embed.txt
If this parameter is true (by default  it is) it loads the
DomTextMapper, TextPosition, FuzzyTextAnchors, PDF plugins.

Fixes #1233
Revert "Add simple on/off option to whether load dtm or not"

This reverts commit 4eb0de8ea0de8098e2771c8a276d75434f2c99f6.
Update Annotator to 4158d0a5 (typed-packaging branch)
Add support for the `?dtm=false'` parameter to embed.js, as described in #1233.