doc_demo -> init. Now with selective power.

Changed default setting, so normal users cannot read the document history #58
Added additional parameters for init:
 * python manage.py init --basic-setup : basic settings for groups & users
 * python manage.py init --make-demo : creates demo enviroment without
	documents
 * python manage.py init --bibtex, -b : only imports bibtex files from olddb
added price parsing. Some adjustments for init, too.
Merge branch 'migration' of github.com:WiReSEP/WireLib2012 into migration