extend drop target to include the box of servers

Fixes bnc#838662
added methods for validating the existence of a db proposal
Merge pull request #786 from mapleoin/droptarget

Got +1 and tested => merging.
Merge pull request #783 from mapleoin/find-database

Got smoketested, and +1 from me too => merging.
Full integration of twitter bootstrap, refactorings on multiple places and integrated proposal form dsl