Restructure backend for 2.0.

- migrate dependecy management vom make to npm (package.json)
- locate start script, config files, node_modules in root dir
Return question type in list.
New structure using Angular.
Hide tabs based on selection state.
Add Underscore, BoostrapUI
Fix empty href attribtue
Structure app in separate controllers, services
Bump angular to 1.2.0-rc3
Add abstracts
Add filter module
Question list buttons as list
Add annotation interface
Collapse result areas when starting new search
User button to the right
Depend on filter module
Create new questions with version 2 by default
Perform search result transformation in service
Search tab
Question as headline
Improve list display