enable embed layout for bootstreap

[Robert Jäschke]

The embed format delivers the post list without the surrounding header/footer to allow embedding of the result into other pages using iframes. Unfortunately, this does no longer work: upon accessing the URL http://www.bibsonomy.org/user/jaeschke/myown?items=1000&resourcetype=publication&sortPage=year&sortPageOrder=desc&format=embed with Bootstrap enabled, an error is returned (cf. also my homepage).

[Sebastian Böttger]

resolves issue #2101

→ <<cset 812134245eff>>